Log In Log In  |  Checkout   |  154 item(s)
1 x HK120-P-TK-220V for EURO 220V / 50Hz
3 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x Bundle Filter KPAK-104bm Sediment Carbon DI Resin Membrane
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x HK120-P-TK for USA 110V / 60Hz
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x Panel 1/4 Digital Flow Meter count up total Gallons GPM 56"cable
4 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x Bundle Filter Annual set KPAK-104 Sediment Carbo Block DI Resin
1 x 4th Stage Color Changing DI Filter SC207 for AR-104H
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
2 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO585
1 x Liter Digiflow 1/4NPT Digital Flow Meter count up total Water
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x Panel 1" Digiflow 6710M-88TM Digital Flow Meter count up GPM 115
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x bulk201, Sediment Filter
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 565, Digital Pressure Gauge Tester Monitor
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
5 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x FM214G 1/4" NPT Digital Flow Meter count up total Water Gallons
1 x 741-14, Diverter Valve for Countertop Water Units
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x FRQ550, Flow Restrictor 500 to 600ML / min
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 720, Feed Water Adapter with Needle Valve
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x bulk818, DI resin refill bags Di-Ionization media
1 x *Discontinued* RO155C
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x Micro 1/4 NPT Digital Flow Meter count up total Water Liter LPM
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x bulk213, Inline Carbon Filter
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x FRQ200, Flow Restrictor 200ML / min
1 x FRQ420, Flow Restrictor 420ML / min
1 x FRQ850, Flow Restrictor 850ML / min
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x Bundle Filter Annual set KPAK-104b Sediment Carbon Resin Refill
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x 719, Drain Saddle Clamp / Valve
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x bulkic21, Koolermax Inline Carbon Filter
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x *Discontinued* RO155
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 3rd stage Special High Efficiency Membrane Filter HTFC-150
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal

View Cart$8,265.72
Specials Log InCreate Account Checkout  Shopping Cart154 item(s)
1 x HK120-P-TK-220V for EURO 220V / 50Hz
3 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x Bundle Filter KPAK-104bm Sediment Carbon DI Resin Membrane
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x HK120-P-TK for USA 110V / 60Hz
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x Panel 1/4 Digital Flow Meter count up total Gallons GPM 56"cable
4 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x Bundle Filter Annual set KPAK-104 Sediment Carbo Block DI Resin
1 x 4th Stage Color Changing DI Filter SC207 for AR-104H
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
2 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO585
1 x Liter Digiflow 1/4NPT Digital Flow Meter count up total Water
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x Panel 1" Digiflow 6710M-88TM Digital Flow Meter count up GPM 115
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x bulk201, Sediment Filter
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 565, Digital Pressure Gauge Tester Monitor
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
5 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x FM214G 1/4" NPT Digital Flow Meter count up total Water Gallons
1 x 741-14, Diverter Valve for Countertop Water Units
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x FRQ550, Flow Restrictor 500 to 600ML / min
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 720, Feed Water Adapter with Needle Valve
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x bulk818, DI resin refill bags Di-Ionization media
1 x *Discontinued* RO155C
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x Micro 1/4 NPT Digital Flow Meter count up total Water Liter LPM
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x bulk213, Inline Carbon Filter
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x FRQ200, Flow Restrictor 200ML / min
1 x FRQ420, Flow Restrictor 420ML / min
1 x FRQ850, Flow Restrictor 850ML / min
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x Bundle Filter Annual set KPAK-104b Sediment Carbon Resin Refill
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x 719, Drain Saddle Clamp / Valve
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x bulkic21, Koolermax Inline Carbon Filter
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x *Discontinued* RO155
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 3rd stage Special High Efficiency Membrane Filter HTFC-150
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal

View Cart$8,265.72

ARD, Reducer Fitting Straight Tube OD Stem OD [ARD]

$3.50

ARD, Reducer Fitting Straight Tube OD Stem OD



* ARD, Reducer Fitting Straight Tube OD Stem OD

* Please choose size from the selection box below. First number is tubing OD and second number is Stem OD Outside Diameter (Pipe sizes can be confusing even for the experienced user. Pipe size is not the actual outside or inside diameter of the pipe but is the industry accepted designation. If you have any question please email us first.)
* 1/4" Tube OD x 3/8" Stem OD ARD0406
* 3/8" Tube OD x 1/2" Stem OD ARD0607


* Water & foods use: Products are manufactured from safe, non-toxic materials meeting the requirements of the US FDA, ERAS, ANSI/NSF-51,61, and SK Zert. Our products are widely used in water purification, food/beverage, and pneumatic systems.

* Function & Quality: Provides quick and convenient assembly-saving time & expense.

* Collet Design: Our unique oval collet design is superior and more practical, and is an improvement welcomed by our world wide customers in all industries.

* Additional Applications: Beyond water and food use, fittings can be used with air, gases, vacuum, & liquids. All connections can be assembled & disassembled repeatedly. A broad range of sizes covers a broad scope of applications.

* We carry different fittings in variation of sizes: 1/4", 3/8", or 1/2" adapters, connectors, fittings, or valves.  Most are not listed online, to avoid confusion to majority of RO system customers.  

* Send us a message with specification, intended application, and image of your setup or old fitting  to check if we have what you need. 

Available Options:

Size Combination:

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