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3 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
4 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x 205, 2nd stage carbon block filter (replace every 12 months)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 213, 4th stage inline carbon filter (replace every 12 months)
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 ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x TMR-25A, 2.5 AMP Transformer Power Supply Ballast for 8800 5853
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x AQUATEC CDP 8852-2J03-B424 Booster Pump 220V Euro Transformer
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
4 x 201, 1st stage sediment filter (replace every 6-12 months)
3 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
1 x 752, DC Booster Pump w/ Transformer
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x *Discontinued* RD102
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
6 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x WH-20, Whole House Water Treatment Carbon Block Filter System Bi
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x AQUATEC 8852-2J03-B424 High Flow Booster Pump 110V Transformer
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x PE Tubing Tube Cutter
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish

View Cart$4,558.34
Specials Log InCreate Account Checkout  Shopping Cart117 item(s)
3 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
4 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x 205, 2nd stage carbon block filter (replace every 12 months)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 213, 4th stage inline carbon filter (replace every 12 months)
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 ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
2 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x TMR-25A, 2.5 AMP Transformer Power Supply Ballast for 8800 5853
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x AQUATEC CDP 8852-2J03-B424 Booster Pump 220V Euro Transformer
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
4 x 201, 1st stage sediment filter (replace every 6-12 months)
3 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
1 x 752, DC Booster Pump w/ Transformer
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x *Discontinued* RD102
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
6 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x WH-20, Whole House Water Treatment Carbon Block Filter System Bi
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x AQUATEC 8852-2J03-B424 High Flow Booster Pump 110V Transformer
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x PE Tubing Tube Cutter
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish

View Cart$4,558.34

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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