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2 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x HK120-P-TK-220V for EURO 220V / 50Hz
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 720, Feed Water Adapter with Needle Valve
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x *Discontinued* RD106
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KF750UP, SUBSTITUTE/Upgrade KOOLERMAX Faucet CHROME FINISH
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 706, Membrane Filter Casing Housing Assembly
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 741-14, Diverter Valve for Countertop Water Units
1 x HK120-P-TK for USA 110V / 60Hz
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x *Discontinued* RO155C

View Cart$2,781.15
Specials Log InCreate Account Checkout  Shopping Cart53 item(s)
2 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x HK120-P-TK-220V for EURO 220V / 50Hz
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 720, Feed Water Adapter with Needle Valve
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x *Discontinued* RD106
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KF750UP, SUBSTITUTE/Upgrade KOOLERMAX Faucet CHROME FINISH
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 706, Membrane Filter Casing Housing Assembly
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 741-14, Diverter Valve for Countertop Water Units
1 x HK120-P-TK for USA 110V / 60Hz
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x *Discontinued* RO155C

View Cart$2,781.15

ABU, Bulkhead Union Connector [ABU]

$4.50

ABU, Bulkhead Union Connector



* ABU, Bulkhead Union Connector

* Please choose size from the selection box below. First number is tubing OD Outside Diameter and second number is NPT National Pipe Thread. (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 1/4" NPTF Thread ABU0404
* 1/4" Tube OD x 3/8" NPTF Thread ABU0406
* 3/8" Tube OD x 1/4" NPTF Thread ABU0604
* 3/8" Tube OD x 3/8" NPTF Thread ABU0606
* 1/2" Tube OD x 1/2" NPTF Thread ABU0707


* 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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