Log In Log In  |  Checkout   |  33 item(s)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x KT-103, Optional Manual Membrane Flush Valve
1 x *Discontinued* RD106
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x UU Clips Pair Standard Filter to Standard Filter, 2" x 2"
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 752, DC Booster Pump w/ Transformer
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$1,702.34
Specials Log InCreate Account Checkout  Shopping Cart33 item(s)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x KT-103, Optional Manual Membrane Flush Valve
1 x *Discontinued* RD106
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x UU Clips Pair Standard Filter to Standard Filter, 2" x 2"
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 752, DC Booster Pump w/ Transformer
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$1,702.34

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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