Log In Log In  |  Checkout   |  39 item(s)
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x UU Clips Pair from Bracket to Membrane Filter
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x *Discontinued* RD106
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)

View Cart$1,103.45
Specials Log InCreate Account Checkout  Shopping Cart39 item(s)
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x UU Clips Pair from Bracket to Membrane Filter
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x *Discontinued* RD106
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)

View Cart$1,103.45

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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