Log In Log In  |  Checkout   |  95 item(s)
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 578, TDS Water Quality Meter tds-3
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
2 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 741-14, Diverter Valve for Countertop Water Units
1 x WS-150M, Whole House Water Softener
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 565, Digital Pressure Gauge Tester Monitor
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x *Discontinued* RO585
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x KT-103, Optional Manual Membrane Flush Valve
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x *Discontinued* RO585ERP
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x .K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x *Discontinued* RO6ALK
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x *Discontinued* RD106
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x *Discontinued* RO585A

View Cart$8,429.95
Specials Log InCreate Account Checkout  Shopping Cart95 item(s)
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 578, TDS Water Quality Meter tds-3
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
2 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 741-14, Diverter Valve for Countertop Water Units
1 x WS-150M, Whole House Water Softener
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 565, Digital Pressure Gauge Tester Monitor
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x *Discontinued* RO585
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x KT-103, Optional Manual Membrane Flush Valve
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x *Discontinued* RO585ERP
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x .K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x *Discontinued* RO6ALK
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x *Discontinued* RD106
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x *Discontinued* RO585A

View Cart$8,429.95

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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