Reverse Osmosis Parts for Standard RO Systems


Shutoff valves, John Guest and Jaco Fittings, RO Tanks, Faucets, Filter Housings, Filter and Membrane Mounting Brackets, RO Tank Valves, Drain Saddles, Inlet Saddle Valves, Filter Wrenches, TDS Tester, Tubing, Flow Restrictors and much, much more.


Fix-It-Yourself Reverse Osmosis
Parts & Pieces List

We stock a wide range of standard Reverse Osmosis parts and fittings. If you need help diagnosing an issue or selecting the correct replacement part please give us a call: (940) 382-3814.

Note: For RO Membranes and Cartridges, go to our Cartridge Menu.


Housings & Brackets

Standard filter housing for 2.5" x 9.75" cartridges. 1/4" NPT threaded ports.

$23.00
Part # fh001

Standard filter housing for 2.5" x 9.75" cartridges. 1/4" NPT threaded ports.

$23.00
Part # fh002

Standard filter housing for 2.5" x 9.75" cartridges. 1/4" NPT threaded ports.

$27.00
Part # fh003

Standard reverse osmosis membrane housing. 1/8" NPT threaded ports.

$12.00
Part # mm999

Mounting bracket for 2 filter housings.

$14.00
Part # mb005

Mounting bracket for 3 filter housings.

$16.00
Part # mb003

Contains four #10 Screws, 3/4" long, to mount filter housing to bracket. Use this set if you are attaching a housing without a membrane clip.

$1.00
Part # mb905

Consists of four screws: Three #10 Screws, 3/4" long, and one #10 Screw 1" long. Use this packet to mount filter housing on bracket when one of the screws also holds a membrane clip.

$1.00
Part # mb906

Shutoff Valves

The function of the shutoff valve on undersink reverse osmosis units is to stop the flow of water into the unit when the storage tank is full. More about Reverse Osmosis Shutoff Valves

Jaco-style fittings, nuts included. Horseshoe flow pattern with In/Out on one side and Tank/Tank on the other.

$15.00
Part # rc301

John Guest-style fittings. Horseshoe flow pattern with In/Out on one side and Tank/Tank on the other.

$18.00
Part # rc300

Jaco-style fittings, nuts included. Has straight-through flow pattern.

$15.00
Part # rc304

John Guest-style fittings. Has straight-through flow pattern.

$16.00
Part # rc303

Fittings, Tubing & Accessories

More about Tubing and Fittings

John Guest Fittings
Price

Fits filter housings, but not membrane housings. Can also be used for inline post filters.

$3.05
Part # jg033
$2.70
Part # jg032

Fits filter housings and inline postfilters.

$1.95
Part # jg002

Fits membrane housings, making a straight connection rather than an elbow.

$1.75
Part # jg001

Connects three 1/4" tubes.

$3.85
Part # jg011

Connects three 3/8" tubes.

$4.70
Part # jg012

Plugs into a straight 1/4" John Guest fitting to make a swiveling elbow.

$2.75
Part # jg022

Plugs into a straight 3/8" John Guest fitting to make a swiveling elbow.

$4.60
Part # jg024
Jaco Fittings
Price

This fits most filter vessels, but not membrane housings. Can also be used for inline post filters.

$1.50
Part # ft033

This fits most membrane housings, but not filter vessels.

$1.50
Part # ft032

Fits filter housings and inline filters.

$1.75
Part # ft002

Connects three 1/4" tubes.

$1.75
Part # ft011

Connects three 3/8" tubes.

$4.50
Part # ft012

Connects two 1/4" tubes to a 1/4" female pipe thread. (Commonly used to connect tank and permeate lines to inlet of inline post filter.)

$2.70
Part # ft045
Tubing and Tube Inserts
Price

One foot of white 1/4" tubing. To order multiple feet, change quantity in shopping cart.

$0.15
Part # tb001

One foot of white 3/8" tubing. To order multiple feet, change quantity in shopping cart.

$0.25
Part # tb004

Must use with Jaco fittings. Do not use with John Guest fittings.

$0.10
Part # tb100

Must use with Jaco fittings. Do not use with John Guest fittings.

$0.10
Part # tb101

Mounting Clips

Attaches membrane housing to the filter bracket. Most RO units use two membrane clips.

$2.00
Part # rc208

Attach standard 10" or 6" post filters to the membrane housing. Two clips are normally used for a filter. A single clip will attach a Payne shutoff valve (see above) to the membrane housing.

$2.00
Part # rc200

Tanks & Tank-Valves

More About Tanks and Tank Valves. The tank valve is not included with tank, but can be ordered below. If you are replacing an existing tank, your present tank valve will fit our tank. More RO tank sizes are available here.

“4-Gallon” metal reverse osmosis storage tank. This is a standard-sized undersink tank. It is 11.5" in diameter by 14.5" from the floor to the top of the valve.

$56.00
Part # ta005

Tanks are sold as replacement parts, and do not by default include a tank valve. If you're replacing an existing tank, your old tank valve will probably work. If you want a new valve, please select 1/4" or 3/8" to match your tubing.

Price: $56.00

Fits all standard RO tanks. Connects to 1/4" tubing.

$7.00
Part # jg014

Fits all standard RO tanks. Connects to 3/8" tubing.

$7.00
Part # jg015

Check Valves

Check Valve Discussion. Check valves allow water to flow forward but not backward. Every RO unit has at least one, and we put two on our best units.

Inserts into 1/4" tubing with John Guest-style quick connect fittings.

$14.00
Part # rc001

Inserts into 3/8" tubing with John Guest-style quick connect fittings.

$14.00
Part # rc002

Inserts into John Guest-style quick connect fitting.

$3.50
Part # rc003

Inserts into Jaco-style compression fitting.

$3.50
Part # rc004

Flow Restrictors

Every reverse osmosis unit has a device called a flow restrictor that determines the amount of water that flows to drain. Explanation of flow restrictors

Capillary-Style Inline Flow Restrictors

Insert into 1/4" Drain Line. The number indicates the flow rate, in milliliters per minute. The flow restrictor should match your membrane's production rate.

$7.00
Part # fr000

200 millimeters per minute. Recommended for 18 gpd membrane.

$7.00
Part # fr001

250 millimeters per minute. Recommended for 25 gpd or 36 gpd membrane.

$7.00
Part # fr002

350 millimeters per minute. Recommended for 36 gpd membrane.

$7.00
Part # fr003

420 millimeters per minute. Recommended for 50 gpd membrane.

$7.00
Part # fr004

550 millimeters per minute. Recommended for 50 gpd or 75 gpd membrane.

$7.00
Part # fr005

800 millimeters per minute. Recommended for 75 gpd or 100 gpd membrane.

$7.00
Part # fr006

Insert Style Flow Restrictor

Inserts into either Jaco or John Guest membrane housing elbow with 1/8" threaded fitting. The number indicates the flow rate in gallons per day. The gallon per day rating of a flow restrictor must be appropriate for, but not identical to the membrane's production rating.

Jaco-Style Insert Flow Restrictor
Price

Recommended for a 10 gpd or 12 gpd membrane.

$2.50
Part # fr100

Recommended for 18 gpd membrane.

$2.50
Part # fr101

Recommended for 25 gpd or 36 gpd membrane.

$2.50
Part # fr102

Recommended for 36 gpd membrane.

$2.50
Part # fr103

Recommended for 50 gpd membrane.

$2.50
Part # fr104

Recommended for 50 gpd membrane.

$2.50
Part # fr105
John Guest-Style Insert Flow Restrictor
Price

Recommended for 10 or 12 gpd membrane.

$2.50
Part # fr200
$2.50
Part # fr201

Recommended for 25 gpd or 36 gpd membrane.

$2.50
Part # fr202
$2.50
Part # fr203
$2.50
Part # fr204
$2.50
Part # fr205

Faucets

We carry several faucets that will replace the standard equipment faucet on any reverse osmosis unit, regardless of brand. Below is our least expensive faucet, in ‘air gap’ style and in non-air gap.

Go here for our full faucet list, as well as links to explanations and discussion of installation, the drilling of holes, the concept of the air gap faucet, and other grippingly interesting topics.

The tough but attractive Tomlinson Pro-Flo faucet is the standard faucet for all our undersink filters and reverse osmosis units. It’s a sturdy top performer that uses the proven, traditional up/down handle style.

$38.00
Part # lf700

The tough but attractive Tomlinson Pro-Flo faucet is the standard faucet for all our undersink filters and reverse osmosis units. It’s a sturdy top performer that uses the proven, traditional up/down handle style.

$48.00
Part # lf701

Inlets and Drains

This valve can be used to tap into copper pipe from 3/8" to 5/8" diameter. It comes with hardware to make a standard 1/4" compression fitting, and a 1/4" John Guest faucet/refrigerator adaptor is also included. (Please tell us if you need to connect to 3/8" tubing.)

$16.00
Part # iv100

Use with 3/8" flexible water lines (typically, braided stainless steel). Connects to the lower end of the flexible line. This adapter comes with inline valve (see jg039 below) and tubing. Everything you need to connect a 1/4" inlet line.

$16.00
Part # iv103

Use with 1/2" flexible water lines (typically, braided stainless steel). Connects to the upper end of the flexible line. This adapter comes with inline valve (see jg039 below), plug-in elbow, and tubing. Everything you need to connect a 1/4" inlet line.

$16.00
Part # iv101

When installed, you can just push your 1/4" drain tubing into the fitting. If you prefer a Jaco-style fitting, let us know. The price is the same.

$9.00
Part # rc100

When installed, you can just push your 3/8" drain tubing into the fitting. If you prefer a Jaco-style fitting, let us know. The price is the same.

$14.00
Part # rc103

Use as an inlet valve, a shutoff valve for the icemaker line, or anywhere an inline valve is needed.

$6.00
Part # jg039

Use as an inlet valve, a shutoff valve for the icemaker line, or anywhere an inline valve is needed.

$7.00
Part # jg040

R.O. Accessories

HMDigital TDS Tester, measures 0 to 1000 parts per million total dissolved solids. A very handy tool for reverse osmosis owners; it tells you when your membrane needs replacement. TDS Tester Discussion.

$33.00
Part # rc400

Consists of a John Guest tubing tee, a John Guest refrigerator connector, a John Guest inline valve, and enough 1/4" tubing to connect your RO unit to your refrigerator. When ordering, please tell us in the “comments” section how much tubing you'll need.

$14.00
Part # rc800

A unique leak prevention system from Watts that detects leaks and turns off the water supply when moisture is detected under the sink. Click here for info.

$18.00
Part # lp402

A solid plastic spanner wrench for opening and tightly closing Flowmatic 2.5" X 9.75" filter housings. Fits our Countertop Filters, Undersink Filters, Reverse Osmosis Units, and Pura UV1 units.

$4.00
Part # wr001

Low inlet pressure? See the Aquatec electric Booster Pumps & non-electric Permeate Pump.

Air gap faucet problems? Take a look at our Air Gap Drain Adapter.

Filter Cartridges & Membranes for Standard, Hydrotech & Clack (Microline) RO units.

We stock all parts for standard RO units.
If you don't see what you need on this page, give us a call (940) 382-3814.


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