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2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 719, Drain Saddle Clamp / Valve
1 x 741-14, Diverter Valve for Countertop Water Units
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FRQ200, Flow Restrictor 200ML / min
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
2 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x UU Clips Pair Standard Filter to Standard Filter, 2" x 2"
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x bulkc10, Koolermax Carbon Block Filter
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x UU Clips Pair from Bracket to Membrane Filter
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$1,865.10
Specials Log InCreate Account Checkout  Shopping Cart55 item(s)
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 719, Drain Saddle Clamp / Valve
1 x 741-14, Diverter Valve for Countertop Water Units
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FRQ200, Flow Restrictor 200ML / min
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
2 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x DM-2, Inline Dual TDS monitor (meter) for RO DI System DM2
1 x UU Clips Pair Standard Filter to Standard Filter, 2" x 2"
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x bulkc10, Koolermax Carbon Block Filter
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x UU Clips Pair from Bracket to Membrane Filter
1 x 1st stage SF05 sediment filter (replace every 6-12 months)

View Cart$1,865.10

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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