Log In Log In  |  Checkout   |  60 item(s)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x O-RINGs FOR UV STERILIZATION SYSTEMS 6W 14W
1 x TMR-220V-1A Aquatec TACS234-19 Transformer Power Supply EuroPlug
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
2 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 225, 5th stage Inline Alkaline filter with clear case (annual)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x MK420, Maintenance kit for RO565
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x TMR-AQT-2A, Transformer Power Supply Aquatec TACS114-48 for 8800
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x TMR-DC-1212, Transformer Power Supply for Delivery Demand Pump
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO

View Cart$1,295.08
Specials Log InCreate Account Checkout  Shopping Cart60 item(s)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x O-RINGs FOR UV STERILIZATION SYSTEMS 6W 14W
1 x TMR-220V-1A Aquatec TACS234-19 Transformer Power Supply EuroPlug
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
2 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 225, 5th stage Inline Alkaline filter with clear case (annual)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x MK420, Maintenance kit for RO565
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x TMR-AQT-2A, Transformer Power Supply Aquatec TACS114-48 for 8800
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x PSW-280 Aquatec Pressure Switch 80 psi shut off 1/4 tubing TSO
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x TMR-DC-1212, Transformer Power Supply for Delivery Demand Pump
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO

View Cart$1,295.08

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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