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1 x Optional: 564 Membrane Filter Housing Wrench Opener
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KT-103, Optional Manual Membrane Flush Valve
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FM10, STEEL BRACKET SINGLE HOUSING MOUNTING SYSTEM
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x bulk818, DI resin refill bags Di-Ionization media
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 752, DC Booster Pump w/ Transformer
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x bulk205, Carbon Block Filter
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x TMR-AQT-2A, Transformer Power Supply Aquatec TACS114-48 for 8800
2 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x *Discontinued* RO585ERP
1 x *Discontinued* RO6ALK

View Cart$2,642.40
Specials Log InCreate Account Checkout  Shopping Cart40 item(s)
1 x Optional: 564 Membrane Filter Housing Wrench Opener
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KT-103, Optional Manual Membrane Flush Valve
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FM10, STEEL BRACKET SINGLE HOUSING MOUNTING SYSTEM
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x bulk818, DI resin refill bags Di-Ionization media
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 752, DC Booster Pump w/ Transformer
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x bulk205, Carbon Block Filter
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x TMR-AQT-2A, Transformer Power Supply Aquatec TACS114-48 for 8800
2 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x *Discontinued* RO585ERP
1 x *Discontinued* RO6ALK

View Cart$2,642.40

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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