Log In Log In  |  Checkout   |  58 item(s)
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x bulk213, Inline Carbon Filter
1 x bulksf05, Koolermax Sediment Filter
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x bulk818, DI resin refill bags Di-Ionization media
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x WH-25, Whole House Water Treatment Sediment Filter System 20" Bi
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x Panel 1/4 Digital Flow Meter count up total Gallons GPM 56"cable
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x FM-8100T, DigiFlow Digital Water Flow Rate Meter 56" cable
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter

View Cart$2,975.14
Specials Log InCreate Account Checkout  Shopping Cart58 item(s)
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
2 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x bulk213, Inline Carbon Filter
1 x bulksf05, Koolermax Sediment Filter
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x bulk818, DI resin refill bags Di-Ionization media
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x WH-25, Whole House Water Treatment Sediment Filter System 20" Bi
1 x AQF-600-105, Flow Meter Panel Mount 1/2" MPT
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x Panel 1/4 Digital Flow Meter count up total Gallons GPM 56"cable
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x FM-8100T, DigiFlow Digital Water Flow Rate Meter 56" cable
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter

View Cart$2,975.14

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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