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1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x bulksf05, Koolermax Sediment Filter
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x FRQ300, Flow Restrictor 300ML / min
1 x .K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x *Discontinued* RO585
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
2 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
2 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x *Discontinued* RO585NTF
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001

View Cart$4,042.84
Specials Log InCreate Account Checkout  Shopping Cart75 item(s)
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
2 x 701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x 701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x 205 2nd stage solid carbon block filter (replace every 12 month)
1 x 4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x 335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
3 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 4th stage Optional Refill bag #818 DI Resin Refill Bag
2 x 531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x .K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x bulksf05, Koolermax Sediment Filter
2 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x KF511, Polished Chrome Cross-Handle with Gold Trim Faucet
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x CKV0402, Blue color Elbow Check Valve Elbow Type
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x FRQ300, Flow Restrictor 300ML / min
1 x .K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
2 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
1 x .AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 568,Heavy-Duty Filter Housing Wrench, HoneyWell or FilterCold
1 x 718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x 6044-combo Compression Type Fitting Elbow and Tee fitting
2 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x .AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x MK225, Maintenance kit for Honeywell RO9100 Filtercold RO5 AV180
1 x *Discontinued* RO585
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134
3 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x 1044-K Male Connector 1/4 OD x 1/4 NPT Compression Fitting
2 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
2 x FPK, High Quality Fitting and Connector 3/8" (Value-Pack)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x *Discontinued* RO585NTF
1 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x 532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x 202,1 MICRON Sediment filter (replace every 6-12 month) SED1001

View Cart$4,042.84

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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