Log In Log In  |  Checkout   |  51 item(s)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x *Discontinued* RO155
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x *Discontinued* RD150
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x 578, TDS Water Quality Meter tds-3
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P

View Cart$3,647.20
Specials Log InCreate Account Checkout  Shopping Cart51 item(s)
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x *Discontinued* RO155
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x *Discontinued* RD150
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x Panel 3/4" 6710M-66TM Digital Flow Meter count up GPM 115V
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x 578, TDS Water Quality Meter tds-3
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P

View Cart$3,647.20

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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