Log In Log In  |  Checkout   |  41 item(s)
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 913, 5th stage inline carbon filter (every 12 months)

View Cart$783.04
Specials Log InCreate Account Checkout  Shopping Cart41 item(s)
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
2 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 913, 5th stage inline carbon filter (every 12 months)

View Cart$783.04

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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