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2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
4 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
2 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
2 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 752, DC Booster Pump w/ Transformer
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 213, 4th stage inline carbon filter (replace every 12 months)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 706, Membrane Filter Casing Housing Assembly
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x FRQ420, Flow Restrictor 420ML / min
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x FRQ200, Flow Restrictor 200ML / min
1 x 205, 5th stage final carbon filter
1 x .AR150PNTF, KoolerMax AR150P RO System Shell without tank faucet
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x 741-14, Diverter Valve for Countertop Water Units
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)

View Cart$2,336.90
Specials Log InCreate Account Checkout  Shopping Cart61 item(s)
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
4 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
2 x 602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
2 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 752, DC Booster Pump w/ Transformer
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x PSW-350, Pressure Switch for RO Booster Pump 1/4" TSO
1 x 213, 4th stage inline carbon filter (replace every 12 months)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 706, Membrane Filter Casing Housing Assembly
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x FRQ420, Flow Restrictor 420ML / min
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 741-38, Diverter Valve for RO DI Water Systems
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 799, Siphon Pump Drinking Water Liquid Fluid Oil Manual Trasfer
1 x 718b Blue Color Tubing 24 feet 1/4" LLDPE PE tube drinking water
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x FRQ200, Flow Restrictor 200ML / min
1 x 205, 5th stage final carbon filter
1 x .AR150PNTF, KoolerMax AR150P RO System Shell without tank faucet
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x 741-14, Diverter Valve for Countertop Water Units
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)

View Cart$2,336.90

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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