Log In Log In  |  Checkout   |  41 item(s)
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x *Discontinued* RO585NTF
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 718TB12, Half Inch Tubing 20 feet 1/2" LLDPE PE White Tube
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x *Discontinued* RO6ALK
1 x *Discontinued* RD106
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Dispense
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x FRQ300, Flow Restrictor 300ML / min
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x Parts, Ro Water System Installation Parts Bag 1/4"

View Cart$2,067.00
Specials Log InCreate Account Checkout  Shopping Cart41 item(s)
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x KF612, Elite Series: Oil Rubbed Bronze ORB Drinking Water Faucet
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x *Discontinued* RO585NTF
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x PH80, Digital pH Meter Hydrotester Calibration Storage Solutions
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 718TB12, Half Inch Tubing 20 feet 1/2" LLDPE PE White Tube
1 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
1 x *Discontinued* RO6ALK
1 x *Discontinued* RD106
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Dispense
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x FRQ300, Flow Restrictor 300ML / min
1 x .K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x Parts, Ro Water System Installation Parts Bag 1/4"

View Cart$2,067.00

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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