Log In Log In  |  Checkout   |  41 item(s)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x KF750, Elite Series: Polish Chrome Drinking Water Faucet
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
2 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x *Discontinued* RD106

View Cart$1,472.90
Specials Log InCreate Account Checkout  Shopping Cart41 item(s)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x KF750, Elite Series: Polish Chrome Drinking Water Faucet
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
2 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x *Discontinued* RD106

View Cart$1,472.90

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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