Log In Log In  |  Checkout   |  62 item(s)
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
2 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 719, Drain Saddle Clamp / Valve
2 x 205, 2nd stage carbon block filter (replace every 12 months)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x PE Tubing Tube Cutter
2 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 706, Membrane Filter Casing Housing Assembly
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch

View Cart$1,767.95
Specials Log InCreate Account Checkout  Shopping Cart62 item(s)
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
2 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 719, Drain Saddle Clamp / Valve
2 x 205, 2nd stage carbon block filter (replace every 12 months)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x PE Tubing Tube Cutter
2 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 706, Membrane Filter Casing Housing Assembly
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch

View Cart$1,767.95

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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