Log In Log In  |  Checkout   |  27 item(s)
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)

View Cart$598.80
Specials Log InCreate Account Checkout  Shopping Cart27 item(s)
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x O-RING FOR WH10 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 10" CANISTER
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)

View Cart$598.80

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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