Product review (4 stars): Works as Intended. A little pricey for what it is but I could not find it at my local hardware store.
Bought this to replace a faulty check valve in my GE Smartwater RO system. Just make sure you know which is the check valve and which is not as they are close together and from the exterior, look identical. I almost ordered the regular valve online instead of the actual "check valve". Anyway, my old check valve I could blow air (by mouth) both ways, where it is only supposed to allow passage one way. The new valve was easy to install and seemed to work fine. Gave it 4 stars instead of 5 due to it being a little pricey for what it is.