Log In Log In  |  Checkout   |  155 item(s)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
3 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
2 x KT-103, Optional Manual Membrane Flush Valve
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
2 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x FM10, STEEL BRACKET SINGLE HOUSING MOUNTING SYSTEM
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 719, Drain Saddle Clamp / Valve
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x SET8855-300 Aquatec 5853 Booster Pump Assembly for 300GPD RO Sys
2 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SV-24AC-14, Solenoid Valve ESO for Aquatec pump 1/4" wiring
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 565, Digital Pressure Gauge Tester Monitor
2 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
4 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 752, DC Booster Pump w/ Transformer
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 335, 3rd stage TFC 35/45 US membrane filter (every 2-3 yrs)
1 x ACT-820-JG Aquatec Pulsation Dampener Accumulator Pressure Tank
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
3 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x HK120-PUMP KoolerMax Aeroponics Hydroponics System Booster Pump
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x bulkic21, Koolermax Inline Carbon Filter
1 x *Discontinued* RD106
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
2 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x *Discontinued* RD102
1 x 723, Feed Water Adapter with Ball Valve
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x bulkc10, Koolermax Carbon Block Filter
1 x 578, TDS Water Quality Meter tds-3
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
2 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x bulk818, DI resin refill bags Di-Ionization media
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO

View Cart$9,838.51
Specials Log InCreate Account Checkout  Shopping Cart155 item(s)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
3 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
2 x KT-103, Optional Manual Membrane Flush Valve
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
2 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x FM10, STEEL BRACKET SINGLE HOUSING MOUNTING SYSTEM
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 719, Drain Saddle Clamp / Valve
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x SET8855-300 Aquatec 5853 Booster Pump Assembly for 300GPD RO Sys
2 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SV-24AC-14, Solenoid Valve ESO for Aquatec pump 1/4" wiring
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 565, Digital Pressure Gauge Tester Monitor
2 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
4 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 752, DC Booster Pump w/ Transformer
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 335, 3rd stage TFC 35/45 US membrane filter (every 2-3 yrs)
1 x ACT-820-JG Aquatec Pulsation Dampener Accumulator Pressure Tank
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
3 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x HK120-PUMP KoolerMax Aeroponics Hydroponics System Booster Pump
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x bulkic21, Koolermax Inline Carbon Filter
1 x *Discontinued* RD106
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
2 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x *Discontinued* RD102
1 x 723, Feed Water Adapter with Ball Valve
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x bulkc10, Koolermax Carbon Block Filter
1 x 578, TDS Water Quality Meter tds-3
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
2 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x bulk818, DI resin refill bags Di-Ionization media
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO

View Cart$9,838.51

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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