Log In Log In  |  Checkout   |  28 item(s)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x bulk213, Inline Carbon Filter
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)

View Cart$1,588.44
Specials Log InCreate Account Checkout  Shopping Cart28 item(s)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x bulk213, Inline Carbon Filter
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
2 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)

View Cart$1,588.44

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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