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1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
3 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x Aeroponics HighPressure Booster Pump Aquatec CDP5853 Transformer
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
2 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for

View Cart$1,631.20
Specials Log InCreate Account Checkout  Shopping Cart39 item(s)
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
3 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x Aeroponics HighPressure Booster Pump Aquatec CDP5853 Transformer
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 214, Clear Inline Filter Cartridge Empty Case
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
2 x NM-5102, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for

View Cart$1,631.20

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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