Log In Log In  |  Checkout   |  33 item(s)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x Bundle Filter KPAK-104bm Sediment Carbon DI Resin Membrane
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x .K6150PNTF, KoolerMax K6150P RO System Shell without tank faucet
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x *Discontinued* RD106
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2

View Cart$2,111.90
Specials Log InCreate Account Checkout  Shopping Cart33 item(s)
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x DB40, DI Resin Refill Bag for DI210, RD322
1 x Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x Bundle Filter KPAK-104bm Sediment Carbon DI Resin Membrane
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x .K6150PNTF, KoolerMax K6150P RO System Shell without tank faucet
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x .K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x *Discontinued* RD106
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2

View Cart$2,111.90

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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