The Damond Motorsports check valves come pre-assembled with fittings in the configurations you need. We use very low cracking pressure valves, to ensure a smooth effortless operation. Alternatively the spring in these valves can be removed to allow for no cracking pressure. Common for low-pressure sides of PCV systems.Â
The 3/8"Â size valves come in either a barb or a push-lock style fitting.
The 5/8" barbed valves use plastic 90° fittings, and straight brass barbed fittings.Â
Hose clamps are recommended on the barb style fittings, but not required for the push-lock style. The push-lock style generally does require an assembly tool to install the hose over the fittings.Â
Most of our OCC kits in different Stages come with check valves included. However, if you're needing more for a custom set-up, or to add one on your existing set-up, there is now an option. If you need a custom size not offered here, please contact us for a quote.Â
Common check valve applications:
Mazdaspeed:
| 5/8" 90 outlet | the valve used in our Stage 1 OCC kits |
| 5/8" straight | used in Stage 2 Route 2 OCC kit, or with aftermarket intake manifolds and a Stage 1 kit |
| 3/8" straight | used as an aftermarket brake booster check valve |
Ford:
| 3/8" pushlock straight | Â the valve used in our Stage 1 OCC kits (requires a lot of force to seat the hose) |
| 3/8" barb straight | use if your OCC does not come with a check valve and you wish to set it up like our Stage 1 kit |
I saw this as a recommendation to the cheaper Add W1 check valves. These came days before my track day at VIR. No issues. They are very good quality.
They are probably Excellent if they're only being used as a pcv. They're useless being used as a check valve to prevent oil drain back.
Thank you for your feedback. We would not recommend using these valves in the way you have them installed. These valves are spec'd for PCV systems. For use in other applications, it is best to contact us prior to ordering, as we can source a valve with a cracking pressure better suited for your application.
Great build quality, shipped and arrived quickly. Item exactly as described and integrated into the catch can system perfectly on my turbocharged four cylinder and initial impression is that it works: no symptoms of boost loss and there's oil in the can so all appears to be good.
Heavy duty, sturdy, robust product. You get what you pay for! Reminds me of Jurassic Park âIs it heavy?â âYeah,â âThen itâs probably expensive, put it backâ ha. I canât say how nice the actual valve intervals are but the product seems bad ass and to be doing itâs job! Iâm super happy with it.
I purchased a check valve with a 90* piece and installed it on a freshly built mazdaspeed 6 motor. Havenât had a chance to use it much but product was of excellent quality! The shipping was within 2-3 days, so very quick in my opinion. Would definitely suggest to anyone looking to buy to just go for it! Thanks again DM for great Mazdaspeed products!!
Fast shipping, good quality and packaging.
Installed in line for a pcv catchcan. Works great and feels sturdy. Shipped quickly.
Trust worthy and long lasting, love these check valves
Shipping takes so long for a small item
Very high quality! Replaced my 10 year old one just as preventive.
Check valve worked perfectly, extremely convenient to be able to place it wherever needed, an excellent solution for our K swapped Miata. Damond handled shipping incredibly quickly as well. Will happily buy again and recommend to anyone.
I was having problems with pressure from my supercharger blowing out my valve cover seal making a huge oily mess in my engine bay. After replacing the seal and installing this check valve in the outgoing hose between the catch can and the intake tube the problem is solved and my engine bay is still leak free after about 3 weeks of daily driving with about a 30 minute commute to work. Great value and good quality check valve.
Best check valve for the money, opens fast and easy. Fits great with my custom catch can setup on the focus st.
This is the first check that actually worked on my 2006 Saab 95 !
The brass material looks and feels that it will last . So far it holding boost and my vacuum has increased which has helped the spool up of the turbo!
Arrived on time. Seems to work well.
Works great no issues at all
Pretty sure if the car caught fire and rolled down a mountain, this thing would be one of the few surviving components.
Great product! Extremely well made and feels very substantial compared to the check valve I received with my original catch can.
These check valves are Motorsports quality. None of that cheap Chinese shit on eBay or Amazon or Ching Changâs turbo parts from whoever you been buying from before coming here to look at check valves. On top of all that, if youâre not already looking here for a quality check valve, chances are youâre probably already pressurizing your catch can system and crankcase so youâll be looking for new short blocks sooner than you expect. I donât even own a vehicle that these guys plunder on, I have a twin turbo Infiniti and I knew to come here. Grateful for your quality and attention to detail on your cracking pressure for the vacuum side, this is a high quality part, the only sad thing is, I doubt itâs ever gonna fail meaning I likely wonât need to give you more of monies đ
A high quality little in-line low pressure check valve, it worked perfect for my PCV application.
Just this weekend November 22. I had the opportunity to install the check valve on my 2013 Mazda speed 3. My speed idols better drives even better. I am very well impressed with the craftsmanship of this part and the functionality of it. thank you
PERFECT READY TO BE BOLTED ON
Check valve works perfect actually need a couple more
Check valves were purchased to replace the ones that were given to me with a dual baffle catch can.. these Check Valves work wonders and cleared my vacuum leak.
works great, very nice part came in ready to go with thread sealant already applied when installing to barbed ends!
Great product fast shipping
Good quality - recommend getting these!
Robust check valve that worked well and as expected l
Awesome part worth Every penny. Stopped my turbo from smoking
Well made / very high quality!
