Log In Log In  |  Checkout   |  47 item(s)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x SV-24AC-14, Solenoid Valve ESO for Aquatec pump 1/4" wiring
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x bulk818, DI resin refill bags Di-Ionization media
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x bulk201, Sediment Filter
1 x WS-150M, Whole House Water Softener
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO

View Cart$5,484.99
Specials Log InCreate Account Checkout  Shopping Cart47 item(s)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x .SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x SV-24AC-14, Solenoid Valve ESO for Aquatec pump 1/4" wiring
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 578b, TDS-3 Battery Batteries for #578 TDS Water Quality Meter
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x bulk818, DI resin refill bags Di-Ionization media
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x bulk201, Sediment Filter
1 x WS-150M, Whole House Water Softener
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x 6th Stage pn215 Refillable inline DI filter (color change)
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x DI210, Heavy-duty DI system for Aquarium and Reef
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x 316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO

View Cart$5,484.99

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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