Mur-lok Inline Check Valve 1/4" x 1/4" Push Connect

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Mur-lok Inline Check Valve 1/4" x 1/4" Push Connect

100% Recommend this to a friend (34 of 34)

SKU: 200027

reg. $8.99

Special Price: $7.64

In Stock: 339
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Quick Overview

Mur-lok RO fittings are the only RO fittings that feature dual EPDM O-rings to ensure a straight leak free fit. These high quality American made fittings are constructed with FDA approved materials.

  • Inline Check Valve 1/4" Push Connect x 1/4" Push Connect

  • Polypropylene construction

  • Stops water from flowing backwards

  • NSF Standard 58 Certified


Full Details

We believe GA Murdock Mur-lok fittings to be the best so strongly that we use them virtually exclusively on each of our reverse osmosis units and BRS media reactors.


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  • Check Valve By Pat on 2/13/2017

    Needed check valve for RO/DI unit to prevent 'refill and air gap release' during periods of non use. Received promptly and installed quite easily. Works like a charm and is solidly attached to water
    unit. Solid unit and well made.
  • No back-flow By Fishers Coral Reef Farm on 11/23/2016

    I use this to prevent back-flow on my RO/DI system. I tested to see if any water would leak through my backflush line when making RO/DI water and this little check valve held without a drip.
  • Better then the HD. By St0nedMegatr0n on 3/2/2016

    I ended up needing two more of these and purchased them at a big retailer because I did not want to wait for them to come in the mail. The BRS check valve has out lasted the other two.
    I will just purchase extras the next time I have a project. (^_^)
  • Great Check Valve By Rutso on 2/21/2016

    I bought 2 of these, one for my RO DI unit and another for my CO2 injected planted tank, it worked really nicely for both applications.
  • Works well. By Waldo on 5/18/2015

    Used them on my doseing pump to stop back flow worked well
  • Works great By AdamSabina on 4/28/2015

    installed between my RO stage and pressurized water tank for drinking water. To prevent backflow into DI stage
  • Exactly what i needed By FiremanRick on 4/7/2015

    auto shutoff valve didn't work until i added this little guy
  • In-line Check Valve By Shawn on 1/23/2015

    This is easy to install and does exactly what it's suppose to do.
  • Works great By Cesar on 12/13/2014

    Much better than my previous check valve
  • Great product. By Chris on 8/13/2014

    Works great with no leaks or bleed by. Easy install and good price. What's not to like?
  • Good item By Frank on 3/25/2014

    A must have for you auto shut off on r/o unit
  • Just what my RODI unit was missing! By Kevin on 3/10/2014

    I bought a 5 stage RODI unit used from a friend. It worked great but the continuous stream of waste water flowing after the float valve closed left me frustrated. I was under the impression the Auto Shutoff Valve would stop the waste, but it was only part of the answer. After adding this inline check valve between the output of my ro membrane and the auto shutoff valve, the water completely shuts off a few seconds after the float switch engages. I had to watch the product video for the complete float valve/check valve/auto shutoff valve kit to find out where it should go. The valve is sturdy and the tubing locks in solidly.


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Product Questions

Hey guys,

Adding some upgrades to my 4-stage Plus RO/DI. I want to split my product line to two separate locations. If I do the split after the check valve (included in the *Plus system) would I need to add any more of these? Maybe one for redundancy?


Question by: Randy on Oct 11, 2013 5:37:00 AM
Hey Randy,
Sorry but the image doesn't seem to want to cooperate. That said though, no extra check valves should be necessary as long as its split after the check valve . The included check valve on our units is in the membrane housing so you couldn't split before it if you tried. As far as running to multiple locations, its as simple as a tee. I would recommend adding an inline ball valve to each side of the tee so that you can manually control which one is filling if you desire (otherwise it will just favor the path of least resistance). Another option would be to use a 3 way valve, though personally I prefer the two single inline valves as not only is it a bit cheaper last time I checked but you also have the option to leave both open, so in theory it would fill the first container, when the float goes up be forced to go the second container, and when that float goes up be done. With the 3 way ball valve you would have to manually switch from one container to the next. Just my two cents worth :-)
Answer by: Bulk Reef Supply on Oct 11, 2013 5:37:00 AM
Will this work for CO2 line for Calcium RX.
Question by: John H on Jun 14, 2016 12:34:00 PM
This will work perfectly with the Vertex Calcium. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jun 15, 2016 11:14:00 AM
would this work on 1/4 inch airline tubing?
Question by: Matt on Aug 23, 2015 8:30:00 PM
Great question!
You will need to use a Mur-Lok Stem Adapter to convert the Murlok fitting to a barb where the airline could slide over. I have attached a link below.
Answer by: Connor (Admin) on Aug 24, 2015 4:53:00 PM
If the output connection on the RO housing is the Mur-lok Elbow Check Valve (your product SKU: 200801), then this inline check valve would not be necessary to allow for the auto-shutoff valve (your product SKU: 200011) to function correctly, yes?
Question by: Joshua Nelson on May 3, 2016 12:12:00 PM
The check valve is already built into our units and this separate check valve is not required for our auto shut offs to work on our units.
Answer by: Connor (Admin) on May 3, 2016 3:01:00 PM