Log In Log In  |  Checkout   |  53 item(s)
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x *Discontinued* RO585
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 752, DC Booster Pump w/ Transformer
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 205, 2nd stage carbon block filter (replace every 12 months)

View Cart$1,804.58
Specials Log InCreate Account Checkout  Shopping Cart53 item(s)
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x 6044-K Tee Fitting Compression Type 1/4"OD 1/4" NPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x *Discontinued* RO585
1 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x SC435, Specialty Filter Arsenic / Fluoride Removal Filter
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K6150P
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x 4044-K Male Elbow Fitting Compression type 1/4" OD 1/4" NPT
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 5th or 6th Stage IC21 inline carbon filter (every 6 to 12 mons)
1 x 752, DC Booster Pump w/ Transformer
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x 205, 2nd stage carbon block filter (replace every 12 months)

View Cart$1,804.58

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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