Log In Log In  |  Checkout   |  41 item(s)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x KF750, Elite Series: Polish Chrome Drinking Water Faucet
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x FRQ200, Flow Restrictor 200ML / min
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x FRQ420, Flow Restrictor 420ML / min
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x WS-150M, Whole House Water Softener
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System

View Cart$4,120.40
Specials Log InCreate Account Checkout  Shopping Cart41 item(s)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x KF750, Elite Series: Polish Chrome Drinking Water Faucet
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x FRQ200, Flow Restrictor 200ML / min
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD322
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x FRQ420, Flow Restrictor 420ML / min
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x WS-150M, Whole House Water Softener
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x 3.CB2010, 3rd stage carbon block filter 20" inch for RD322 RO260
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System

View Cart$4,120.40

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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