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3 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x *Discontinued* RO155
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
3 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 719, Drain Saddle Clamp / Valve
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
4 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 6th Stage pn215 Refillable inline DI filter (color change)
3 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
2 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
4 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
2 x 723, Feed Water Adapter with Ball Valve
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x WH-20, Whole House Water Treatment Carbon Block Filter System Bi
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x WS-150M, Whole House Water Softener
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x *Discontinued* RO155C
1 x 720, Feed Water Adapter with Needle Valve
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Liter Digiflow 1/4NPT Digital Flow Meter count up total Water
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x SET8855-300 Aquatec 5853 Booster Pump Assembly for 300GPD RO Sys
3 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x CDP6800, AQUATEC CDP6800 Booster Pump Only 6840-2J03-B224
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 752, DC Booster Pump w/ Transformer
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x *Discontinued* RD150
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x *Discontinued* RD102
1 x TMR-25A, 2.5 AMP Transformer Power Supply Ballast for 8800 5853
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 565, Digital Pressure Gauge Tester Monitor
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2

View Cart$8,742.68
Specials Log InCreate Account Checkout  Shopping Cart123 item(s)
3 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x *Discontinued* RO155
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
3 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 719, Drain Saddle Clamp / Valve
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
4 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 6th Stage pn215 Refillable inline DI filter (color change)
3 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
2 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
4 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
2 x 723, Feed Water Adapter with Ball Valve
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x WH-20, Whole House Water Treatment Carbon Block Filter System Bi
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x WS-150M, Whole House Water Softener
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x *Discontinued* RO155C
1 x 720, Feed Water Adapter with Needle Valve
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Liter Digiflow 1/4NPT Digital Flow Meter count up total Water
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x SET8855-300 Aquatec 5853 Booster Pump Assembly for 300GPD RO Sys
3 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x CDP6800, AQUATEC CDP6800 Booster Pump Only 6840-2J03-B224
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 752, DC Booster Pump w/ Transformer
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x *Discontinued* RD150
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x *Discontinued* RD102
1 x TMR-25A, 2.5 AMP Transformer Power Supply Ballast for 8800 5853
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 565, Digital Pressure Gauge Tester Monitor
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2

View Cart$8,742.68

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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