Reverse Osmosis Parts And Accessories
We carry a wide range of parts to service and maintain your existing reverse osmosis system. If you can't find what your looking for, or are unsure of what you need, give us a call and one of our highly trained experts will help find what you are looking for.
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DM-3 HM Digital Commercial In-Line Dual EC/TDS Monitor - 3/8" Tee Fittings
Install on industrial systems such as car washes, window washing, manufacturing, and food processing. Features Highly efficient and accurate due to its advanced microprocessor technology Displays TDS levels of the Feed Water and Product Water with in & out electrode probes Factory Calibrated: our...- $68.54
$74.94- $68.54
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John Guest Quick Connect Plug 1/4" | PP0808W
John Guest Quick Connect 1/4" PlugPart Number: PP0808W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available - Call for Prices About...- $0.75
$0.94- $0.75
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1/4" John Guest Stem x 1/8" MPT Fitting
1/4" John Guest Stem x 1/8" MPT Fitting Part Number: PP050821W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available - Call...- $1.01
$1.26- $1.01
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US Water Chrome Standard Reverse Osmosis Faucet With AirGap
US Water Chrome Standard Reverse Osmosis Drinking Water Faucet - With Airgap If you prefer the standard look of a traditional RO Drinking Water Faucet, then this is it. Timeless design with sleek styling. Push the handle down to dispense a glass or flip...- $29.95
$37.44- $29.95
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Capillary Flow Restrictor for Reverse Osmosis System - 350 mil
300 Mil Capillary Tube Flow Restrictor with 1/4" Quick Connect Fittings A capillary flow restrictor is used to regulate the drain water of a reverse osmosis system. Too much water running to the drain is a waste of water, and too little water running...- $6.95
$8.69- $6.95
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3/8" Quick Connect x 1/4" FPT John Guest Fitting
3/8" Quick Connect x 1/4" FPT John Guest Fitting Part Number: PP451222W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available -...- $7.02
$8.78- $7.02
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1/2" x 1/2" x 3/8" Tube John Guest Quick Connect Reducing Tee
John Guest 1/2" (end) x 1/2" (end) x 3/8" (middle) Quick Connect Reducing Tee Fitting Part Number: PP301612W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless...- $7.20
$9.00- $7.20
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Capillary Flow Restrictor for Reverse Osmosis System - 250 mil
200 Mil Capillary Tube Flow Restrictor with 1/4" Quick Connect Fittings A capillary flow restrictor is used to regulate the drain water of a reverse osmosis system. Too much water running to the drain is a waste of water, and too little water running...- $6.95
$8.69- $6.95
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2" In-Line RO Mounting Clip (2-Pack) | C-2000W
2" White In-Line Mounting Clip Molded Polypropylene Fits RO Systems and Filters requiring 2" Clips Pack of 2 Clips Part #C-2000W- $2.95
$3.69- $2.95
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1/4" Quick Connect x 1/4" FPT John Guest Fitting
1/4" Quick Connect x 1/4" FPT John Guest Fitting Part Number: PP450822W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available -...- $6.70
$8.38- $6.70
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Extra Outlet Reverse Osmosis Kit
Extra Outlet Reverse Osmosis Kit Includes 3/8" tee, valve, and 20 feet tubing- $15.95
$19.94- $15.95
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1/2" John Guest Stem x 3/8" MPT Fitting
1/2" John Guest Stem x 3/8" MPT FittingPart Number: PP051623W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available - Call for...- $2.60
$3.25- $2.60
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G.A. Murdock Mur-lok 3/8” Stem x 1/4” Male NPTF - S0860816B
G.A. Murdock Mur-lok 3/8” Stem x 1/4” Male NPTF - S0660416B Part Number: S0660416B Features Leak Resistant Dual EPDM O-rings UV and Chemical Resistant Polypropylene Certified to NSF/ANSI Standard 58 304 Stainless Steel Gripping Teeth 150 p.s.i. @ 70ºF (10 Bar @ 20ºC) 60...- $3.99
- $3.99
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3/8" Stem x 1/4" Tube John Guest Quick Connect Reducing Elbow
3/8" Stem x 1/4" Tube John Guest Quick Connect Reducing Elbow Fitting - Also Called "Plug-In Ell" Part Number: PP221208W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene...- $4.13
$5.16- $4.13
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FlowLok Leak Detector
FlowLok Leak Detector A leak under your sink could cost you hundreds or even thousands of dollars. Doesn't it make sense to install a FlowLock on the inlet line, so that when a leak is detected, the FlowLock automatically shuts off the water supply?...- $24.95
$36.31- $24.95
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US Water White Residential Filter Housing 2.5" x 10" - 1/2" | HRO-2510
US Water 2.5" x 10" White Residential Filter Housing The US Water 2.5” x 10” Cartridge Housing is a Commercial Grade Housing that will handle heavy filtration needs for years. It accepts any industry standard 2.5” x 10” filter cartridge which includes, pleated, melt...- $15.95
$19.94- $15.95
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John Guest Quick Connect Fitting 1/2” Retaining Clip Red - PIC1816R
John Guest Quick Connect Fitting 1/2” Retaining Clip Red - PIC1816R Part Number: PIC1816R Pure and simple water purification John Guest fittings are suitable for domestic water or for commercial systems, we offer John Guest Fittings which are ideal for filtering, reverse osmosis, cleaning,...- $0.45
$0.56- $0.45
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John Guest Quick Connect Fitting 1/2” Elbow Black - PP0316E
John Guest Quick Connect Fitting 1/2” Elbow Black -PP0316E Part Number: PP0316E Pure and simple water purification John Guest fittings are suitable for domestic water or for commercial systems, we offer John Guest Fittings which are ideal for filtering, reverse osmosis, cleaning, sanitizing, and...- $4.12
$5.15- $4.12
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1/2" Quick Connect x 1/2" MPT John Guest Fitting
1/2" Quick Connect x 1/2" MPT John Guest FittingPart Number: PP011624W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available - Call...- $5.47
$6.84- $5.47
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John Guest 3/8" Quick Connect x 3/8" MPT Straight Shut-Off Valve
John Guest 3/8" Quick Connect x 3/8" MPT Straight Shut-Off ValvePart Number: PPSV011223W This fitting is made of the following components: The body is produced in polypropylene (polypro) 'O'Rings are EPDM The collet is produced in polypropylene with stainless steel teeth Quantity Discounts Available...- $10.07
$12.59- $10.07
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Installation
Installation of a reverse osmosis system can be performed by almost anyone. If you are a little technically inclined, you can most likely install a system yourself. The process may vary slightly depending on your setup and which system you ordered. For the most part, everything you need for installation is provided with the system. The tools you may need to supply yourself are as follows:
- Drill
- 1/4" Drill Bit
- Faucet Drill Bit (size will vary depending on faucet type)
- Philips Head Screwdriver
- Tubing Cutter or Razor Knife
- Channel Lock Pliers
- Adjustable Wrench
To get a preview of installation for an RO system, check out our DIY installation video here!
Maintenance
Sanitization
It recommended that you sanitize your RO system each time you change your filters (every 6 months depending on water quality). To sanitize your system, we recommend the use of Sani-System for RO Systems by Pro Products. The sanitation process itself takes 60 seconds of contact time.

Repairing a Broken Fitting
Occasionally due to shipment or installation, RO fittings can break or leak. For this reason, we supply a spare elbow fitting with every RO unit. If your fitting breaks, you can use this extra fitting to repair your system in under 2 minutes.
Re-Pressurizing an RO Tank
Over time, the RO tank can lose pressure and you could begin to experience some problems. Tanks can be re-pressurized using a tire pressure gauge, and a bike pump or air compressor. The target pressure for our small residential RO systems is typically between 5-7 psi.
Replacement Filters
US Water Systems has more replacement filter packs than any other water treatment site. If you have an RO system, chances are we have replacement filters for your system. Buying a filter pack is fool-proof.

















