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2 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x DDP5800, Aquatec Demand Delivery Pump 5851-7E12 Increase Output
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
2 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x bulk201, Sediment Filter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 723, Feed Water Adapter with Ball Valve
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CP-KOR24, O-RING Oring FOR KOOLERMAX MEMBRANE FILTER HOUSING
1 x AQUATEC 8852-2J03-B424 High Flow Booster Pump 110V Transformer
1 x ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Filter,
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO585
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT

View Cart$1,575.40
Specials Log InCreate Account Checkout  Shopping Cart33 item(s)
2 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x DDP5800, Aquatec Demand Delivery Pump 5851-7E12 Increase Output
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
2 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x bulk201, Sediment Filter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 723, Feed Water Adapter with Ball Valve
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x PSW-3100 Aquatec Pressure Switch 100 psi shut off 3/8 tubing TSO
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CP-KOR24, O-RING Oring FOR KOOLERMAX MEMBRANE FILTER HOUSING
1 x AQUATEC 8852-2J03-B424 High Flow Booster Pump 110V Transformer
1 x ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Filter,
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO585
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT

View Cart$1,575.40

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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