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๐ Upgrade your flow game with leak-free, tool-free precision!
The John Guest 3/8 Inch Imperial Single Check Valve is a compact, durable plumbing fitting designed to prevent reverse water flow. Featuring push-to-connect technology with EPDM O-rings, it ensures quick, reliable, and leak-free connections compatible with plastic and soft copper tubing. Made from FDA-compliant polypropylene and certified by NSF 61 and 51, it guarantees safety and chemical resistance for applications like reverse osmosis, beverage dispensing, and aquatics.

















| ASIN | B005XTY90A |
| Best Sellers Rank | #33,428 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #52 in Check Valves |
| Brand | John Guest |
| Brand Name | John Guest |
| Connector Type | Tube OD |
| Customer Reviews | 4.5 out of 5 stars 128 Reviews |
| Exterior Finish | Plastic |
| Global Trade Identification Number | 00665626002564 |
| Included Components | Check Valve |
| Inlet Connection Size | 0.38 Inches |
| Inlet Connection Type | Push |
| Item Dimensions | 2 x 0.75 x 0.75 inches |
| Item Type Name | Plastic Push Check Valve |
| Item dimensions L x W x H | 2 x 0.75 x 0.75 inches |
| Manufacturer | Cash Acme |
| Manufacturer Part Number | 3/8SCV |
| Material | Acetal |
| Material Type | Acetal |
| Model Number | 3/8SCV |
| Number of Pieces | 10 |
| Number of Ports | 2 |
| Outlet Connection Size | 0.38 Inches |
| Outlet Connection Type | Quick Connect |
| Set Name | 1 Plastic Push Check Valve |
| Size | 3/8 in. |
| Thread Type | NPT |
| UPC | 665626002564 665626175220 665626120312 |
| Unit Count | 1.0 Count |
| Valve Type | Check Valve |
R**.
Great, quiet backflow fitting
Used this to prevent backflow on a commercial-grade condensate pump. We have a steam humidifier and so we have to use a pump rated for 212 degree water. The backflow valve that came with the pump was nightmare - horrendous chatter when pumping, then god-awful hammer (and total lack of backflow prevention) on shutoff. This pump uses 3/8โ copper refrigerant line for its output and pumps at a very high rate. This John Guest fitting has been inline for several (peaceful!!) months now. It is utterly silent, adding no turbulence while pumping and providing instant shutoff with no hammering or backflow. Installation is a dream and no leaks or other problems so far.
M**G
Works
Works perfectly with no leakage.
T**C
Overpriced but still worth it.
this check valve is a difficult item to find right now, and I had to pay up for it. but the John guest brand works flawlessly and it's definitely not worth taking the risk having a flood in your house by using one of the Chinese cheap knock offs..
S**E
Didn't work
Didn't work for my project.
T**O
Great backflow prevention
I use these on my iron filter.works great
A**R
๐
Great product. Use about 40 of them a year. Never had a problem. ๐
K**.
To prevent backflow in the RO system.
I bought this to prevent backflow in the feed water to the Ro system. Works just as it should. We live in the country and the electricity goes off at times. Our well kicks on at 40 psi and off at 60 psi. The RO system runs from 20 psi to 40 psi. If the electricity goes off the well pressure could drop below 40 psi and the RO could backflow. This check valve is just a safety device and lends peace of mind. I would buy it again.
G**H
Delivery was next day.
Price was high but this unit is listed as able to handle chlorine without damage. Purchased through Amazon and delivery was the next day.
R**.
10=1
Le descriptif dit 10 !!!! Recu seulement 1 ???
S**Y
Regulator protect
Save's my co2 regulator from getting liquid from kegs
B**D
great product
just what I needed
Trustpilot
2 weeks ago
2 months ago