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1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CBV-38, Tank Ball Valve to 3/8 tubing
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x *Discontinued* RO585
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
2 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 752, DC Booster Pump w/ Transformer
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 310, 2nd stage CTA 10 US Membrane filter
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch

View Cart$1,731.40
Specials Log InCreate Account Checkout  Shopping Cart55 item(s)
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CBV-38, Tank Ball Valve to 3/8 tubing
3 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x 732, Inline Pressure Gauge 0 to 300 psi for RO filter system
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x FM214G, FM-6710M DigiFlow Digital Water Flow Meter Gauge Moniter
1 x *Discontinued* RO585
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
2 x Parts, Ro Water System Installation Parts Bag 1/4"
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x .K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x 752, DC Booster Pump w/ Transformer
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 310, 2nd stage CTA 10 US Membrane filter
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 5th Stage pn215 Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch

View Cart$1,731.40

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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