Log In Log In  |  Checkout   |  33 item(s)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
2 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 723, Feed Water Adapter with Ball Valve
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x *Discontinued* RD106
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155

View Cart$1,129.44
Specials Log InCreate Account Checkout  Shopping Cart33 item(s)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x WH-5, Whole House Water Treatment Sediment Filter System 10" Big
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
2 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 723, Feed Water Adapter with Ball Valve
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x *Discontinued* RD106
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155

View Cart$1,129.44

ATU TEE Union Connector Quick Connect QC Fitting [ATU]

$3.50

ATU TEE Union Connector Quick Connect QC Fitting



* ATU TEE Union Connector, Quick Connect

* Please choose size from the selection box below. Both numbers are tubing OD Outside Diameter. First number is Tee double side and second number is the single side. (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" Tube OD ATU0404
* 3/8" Tube OD x 1/4" Tube OD ATU0604
* 3/8" Tube OD x 3/8" Tube OD ATU0606
* 1/2" Tube OD x 3/8" Tube OD ATU0706
* 1/2" Tube OD x 1/2" Tube OD ATU0707


* 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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