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2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x DI210, Heavy-duty DI system for Aquarium and Reef
2 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x 752, DC Booster Pump w/ Transformer
4 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x CDP6800T110V, AQUATEC Booster Pump Transformer 6840-2J03-B224
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x MK420, Maintenance kit for RO565
1 x *Discontinued* RD106
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x 723, Feed Water Adapter with Ball Valve
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
3 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
3 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Dispense
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x *Discontinued* RO585A
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Special Filter Kit Koolermax dealer distribution kit
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"

View Cart$4,161.40
Specials Log InCreate Account Checkout  Shopping Cart94 item(s)
2 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x DI210, Heavy-duty DI system for Aquarium and Reef
2 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x 752, DC Booster Pump w/ Transformer
4 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 204, 2nd stage GAC filter (replace every 6-12 months)
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x CDP6800T110V, AQUATEC Booster Pump Transformer 6840-2J03-B224
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x MK420, Maintenance kit for RO565
1 x *Discontinued* RD106
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x 718xl, Tubing 100 feet 1/4" white tube LLDPE PE for drinking wat
2 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x 723, Feed Water Adapter with Ball Valve
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO6ALK
1 x 709, Automatic Shut Off Valve 4-way Four Way Valve
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
3 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
3 x Special, Single Stage Housing Bracket Shell Connection Kit
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x 550, Standard Chrome Steel Faucet with Spigot for Water Dispense
1 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x *Discontinued* RO585A
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x 755, Aquatec Demand Delivery Pump 5851-7E12-J574 Increase Output
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x Special Filter Kit Koolermax dealer distribution kit
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"

View Cart$4,161.40

AUC Union Connector OD Quick Connect QC Fitting [AUC]

$3.00

AUC Union Connector OD Quick Connect QC Fitting



* AUC, Union Connector, Quick Connect type

* Please choose size from the selection box below. Both numbers are tubing OD Outside Diameter (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 AUC0404
* 3/8" Tube OD x 1/4" Tube OD AUC0604
* 3/8" Tube OD x 3/8" Tube OD AUC0606
* 1/2" Tube OD x 3/8" Tube OD AUC0706
* 1/2" Tube OD x 1/2" Tube OD AUC0707


* 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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