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5 x Parts, Ro Water System Installation Parts Bag 1/4"
3 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
3 x 1st stage SF05 sediment filter (replace every 6-12 months)
3 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
3 x 752, DC Booster Pump w/ Transformer
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
4 x Optional: 564 Membrane Filter Housing Wrench Opener
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
3 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
3 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System

View Cart$2,551.00
Specials Log InCreate Account Checkout  Shopping Cart73 item(s)
5 x Parts, Ro Water System Installation Parts Bag 1/4"
3 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
3 x 1st stage SF05 sediment filter (replace every 6-12 months)
3 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
3 x 752, DC Booster Pump w/ Transformer
2 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 205, 3rd stage solid carbon block filter (replace every 12 month
4 x Optional: 564 Membrane Filter Housing Wrench Opener
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
3 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
3 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6ALK
2 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x 4th stage TFC 75/85 US membrane filter (every 2-3 yrs) M75
3 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x 752set, DC Booster Pump Transformer Solenoid Pressure Switch All
2 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x 277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x TMR-AQT-68, Transformer Power Supply Aquatec TACS114-19EP for 68
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x .AR125 Dual Outputs Aquarium & Home Drinking RO Filter System

View Cart$2,551.00

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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