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1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
2 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x *Discontinued* RO6ALK
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 752, DC Booster Pump w/ Transformer
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x FRQ300, Flow Restrictor 300ML / min
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
2 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 706, Membrane Filter Casing Housing Assembly
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x 3rd stage Special High Efficiency Membrane Filter HTFC-150
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x TMR-220V-1A Aquatec TACS234-19 Transformer Power Supply EuroPlug
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G

View Cart$2,338.44
Specials Log InCreate Account Checkout  Shopping Cart55 item(s)
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
2 x FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
2 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x *Discontinued* RO6ALK
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 752, DC Booster Pump w/ Transformer
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x FRQ300, Flow Restrictor 300ML / min
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x CDP8800, AQUATEC CDP8852-2J03-B424 Booster Pump Only Fitting
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 913, 5th stage inline carbon filter (every 12 months)
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
2 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x ERP1000 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x 706, Membrane Filter Casing Housing Assembly
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x TMR-DC-2412, Transformer Power Supply for #752 Booster Pump
1 x SW SHELL, Countertop SW1 Empty System Only No Filter
1 x 671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x TMR-220V-2A Aquatec TACS234-48 Transformer Power Supply EuroPlug
1 x 3rd stage Special High Efficiency Membrane Filter HTFC-150
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x TMR-220V-1A Aquatec TACS234-19 Transformer Power Supply EuroPlug
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G

View Cart$2,338.44

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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