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1 x bulksf05, Koolermax Sediment Filter
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
3 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x 214, Clear Inline Filter Cartridge Empty Case
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 719, Drain Saddle Clamp / Valve
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x bulk213, Inline Carbon Filter
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
4 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
2 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
2 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x *Discontinued* RO155C
2 x Optional: 564 Membrane Filter Housing Wrench Opener
3 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
2 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x WS-150M, Whole House Water Softener
2 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
5 x 201, 1st stage sediment filter (replace every 6-12 months)
4 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
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 AR104H
1 x 205, 5th stage final carbon filter
1 x bulkc10, Koolermax Carbon Block Filter
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 723, Feed Water Adapter with Ball Valve
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x 316, 2nd stage CTA 16 US Membrane filter
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x 706, Membrane Filter Casing Housing Assembly
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x HK120-P-TK for USA 110V / 60Hz
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 741-14, Diverter Valve for Countertop Water Units
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x HK120-PUMP KoolerMax Aeroponics Hydroponics System Booster Pump
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x 741-38, Diverter Valve for RO DI Water Systems
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x WH-25, Whole House Water Treatment Sediment Filter System 20" Bi
1 x WSACF-150T, Whole House Water Treatment ACF-150T

View Cart$11,692.91
Specials Log InCreate Account Checkout  Shopping Cart137 item(s)
1 x bulksf05, Koolermax Sediment Filter
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
3 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
2 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
3 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x 214, Clear Inline Filter Cartridge Empty Case
2 x 818, DI Resin Refill Bag 16oz (good for up to three refills)
2 x CBV-0404, Tank Ball Valve to 1/4 tubing *standard RO tank size*
2 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x 285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x 721, Self-Piercing Valve, Feed Water Adapter for Copper Pipe
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5
2 x 350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x 719, Drain Saddle Clamp / Valve
1 x KT-103, Optional Manual Membrane Flush Valve
1 x 213, 4th stage inline carbon filter (replace every 12 months)
1 x bulk213, Inline Carbon Filter
2 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
4 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
2 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x EMT-10, Empty Filter Cartridge Casing Housing
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
2 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
2 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x BUNDLE PACK Annual Filter Kit FK4 WaterGeneral 585 106 (4 ITEMS)
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x UC SHELL, Honeywell UC7000 Empty System Only No Filter
2 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle K5150P
2 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x *Discontinued* RO155C
2 x Optional: 564 Membrane Filter Housing Wrench Opener
3 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
2 x FPK, 6 pcs Fitting Pack Union Connector 3/8 x 1/4 inch
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x WS-150M, Whole House Water Softener
2 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
5 x 201, 1st stage sediment filter (replace every 6-12 months)
4 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x HK120-P-TK-220V for EURO 220V / 50Hz
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO260
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 AR104H
1 x 205, 5th stage final carbon filter
1 x bulkc10, Koolermax Carbon Block Filter
2 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 723, Feed Water Adapter with Ball Valve
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x 316, 2nd stage CTA 16 US Membrane filter
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x 706, Membrane Filter Casing Housing Assembly
1 x PSW-380 Aquatec Pressure Switch 80 psi shut off 3/8" tubing TSO
1 x SV-24AC-14, Solenoid Valve for Aquatec pump only 1/4" 24VAC ESO
1 x HK120-P-TK for USA 110V / 60Hz
1 x .AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x SV-24DC-38-Plastic, KSD Solenoid Valve 3/8" 24V DC ESO
1 x 741-14, Diverter Valve for Countertop Water Units
1 x BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD106
1 x HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x NM-5001C, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x 318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x 215, 5th or 6th Stage Refillable inline DI filter (color change)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x 745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 709C, Disc Shape Auto Shut Off Valve 4-way Four Way Valve
1 x HK120-PUMP KoolerMax Aeroponics Hydroponics System Booster Pump
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD150
1 x SVkit, Pump Shutoff Switch Kit for Aquatec Booster Pumps ESO TSO
1 x 741-38, Diverter Valve for RO DI Water Systems
2 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x N-14-1M, Nipple Fitting connector between standard RO housing
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x WH-25, Whole House Water Treatment Sediment Filter System 20" Bi
1 x WSACF-150T, Whole House Water Treatment ACF-150T

View Cart$11,692.91

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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