Log In Log In  |  Checkout   |  55 item(s)
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 752, DC Booster Pump w/ Transformer
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 578, TDS Water Quality Meter tds-3
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 756SET, Aquatec Permeate Pump Reverse Osmosis System ERP1000
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x Aeroponics HighPressure Booster Pump Aquatec CDP5853 Transformer
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x *Discontinued* RD150
1 x *Discontinued* RD106
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x *Discontinued* RO6ALK
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x *Discontinued* RO585NTF
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x DDP5800, Aquatec Demand Delivery Pump 5851-7E12 Increase Output

View Cart$3,122.44
Specials Log InCreate Account Checkout  Shopping Cart55 item(s)
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x PSW-240 Aquatec Pressure Switch 40 psi shut off 1/4" tubing TSO
1 x 288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x BUNDLE PACK ANNUAL FILTER KIT FK3 WaterGeneral 102 150 (3 ITEMS)
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x .K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 752, DC Booster Pump w/ Transformer
1 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x 578, TDS Water Quality Meter tds-3
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 756SET, Aquatec Permeate Pump Reverse Osmosis System ERP1000
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
1 x Aeroponics HighPressure Booster Pump Aquatec CDP5853 Transformer
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x MKP, Maintenance kit for K5150P K6150P AR150P
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x *Discontinued* RD150
1 x *Discontinued* RD106
1 x 324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x TMR-UV-6W, Replacement UV Ballast Transformer 6 Watts for 602 UV
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
1 x FPK, 6 pcs Fitting Pack Union Connector 1/2 x 3/8 inch
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x *Discontinued* RO6ALK
1 x IM60, Ice Maker or RV Water Filter, Inline Typle
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x *Discontinued* RO585NTF
1 x KF511UP SUBSTITUTE/Upgrade Faucet CHROME GOLD TRIM CROSS HANDLE
1 x SV-24AC-38, KSD Solenoid Valve ESO 3/8" brass, 24V AC
1 x DDP5800, Aquatec Demand Delivery Pump 5851-7E12 Increase Output

View Cart$3,122.44

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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