Log In Log In  |  Checkout   |  63 item(s)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x N-14-1M, Nipple Fitting connector between standard RO housing
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x *Discontinued* RD106
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 706, Membrane Filter Casing Housing Assembly
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
2 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x WH-250, Whole House Water Treatment Sediment Carbon Filter Syste
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
4 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
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
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x 752, DC Booster Pump w/ Transformer
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"

View Cart$2,619.45
Specials Log InCreate Account Checkout  Shopping Cart63 item(s)
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FV-15, Bobby Float Valve Top Mount RM292P-N UNS CEL NSF USA
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x N-14-1M, Nipple Fitting connector between standard RO housing
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x *Discontinued* RD106
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 706, Membrane Filter Casing Housing Assembly
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
2 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x SC209, Specialty Filter Nitrate Removal Filter
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x WH-250, Whole House Water Treatment Sediment Carbon Filter Syste
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
4 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x UU Clips Pair Membrane to Filter, 2.5" to 2"
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
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x 752, DC Booster Pump w/ Transformer
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"

View Cart$2,619.45

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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