Log In Log In  |  Checkout   |  33 item(s)
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x FM214G 1/4" NPT Digital Flow Meter count up total Water Gallons
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x 205, 5th stage final carbon filter
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x MK420, Maintenance kit for RO565
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x 316, 2nd stage CTA 16 US Membrane filter
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x 1.SED2005, 1st stage sediment filter 20" inch for RD322 RO260
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
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 818, DI Resin Refill Bag 16oz (good for up to three refills)

View Cart$1,750.45
Specials Log InCreate Account Checkout  Shopping Cart33 item(s)
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x FM214G 1/4" NPT Digital Flow Meter count up total Water Gallons
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x 205, 5th stage final carbon filter
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x MK420, Maintenance kit for RO565
1 x .K5150PNTF, KoolerMax K5150P RO System Shell without tank faucet
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x 316, 2nd stage CTA 16 US Membrane filter
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x 1.SED2005, 1st stage sediment filter 20" inch for RD322 RO260
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
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 818, DI Resin Refill Bag 16oz (good for up to three refills)

View Cart$1,750.45

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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