Log In Log In  |  Checkout   |  45 item(s)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
4 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x .AR150PNTF, KoolerMax AR150P RO System Shell without tank faucet
1 x 720, Feed Water Adapter with Needle Valve
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
4 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x FRQ200, Flow Restrictor 200ML / min
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water

View Cart$1,713.45
Specials Log InCreate Account Checkout  Shopping Cart45 item(s)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
4 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x .AR150PNTF, KoolerMax AR150P RO System Shell without tank faucet
1 x 720, Feed Water Adapter with Needle Valve
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
4 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x CP-KOR45, O RING FOR KOOLERMAX BOTTOM FILTER HOUSING CASING
1 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x KF310UP, SUBSTITUTE/Upgrade to KYTON FAUCET POLISHED CHROME FINI
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x FRQ200, Flow Restrictor 200ML / min
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 717, Tubing 15 feet 1/4" white tube LLDPE PE for drinking water

View Cart$1,713.45

ARD, Reducer Fitting Straight Tube OD Stem OD [ARD]

$3.50

ARD, Reducer Fitting Straight Tube OD Stem OD



* ARD, Reducer Fitting Straight Tube OD Stem OD

* Please choose size from the selection box below. First number is tubing OD and second number is Stem 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 3/8" Stem OD ARD0406
* 3/8" Tube OD x 1/2" Stem OD ARD0607


* 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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