I chose this Speedfit valve because I wanted to fit it to plastic piping that was already in situ. It fitted perfectly.
It has a small central bleed or test nipple covered by a screw cap. It would have been nice to have had some description of what that was intended for. As far as I can tell, it is provided for testing the valve.
I cannot comment on the reliability or effectiveness of the check valves but it seems good."
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Review 2 for JG Speedfit 15DCVP Double Check Valve 15mm
"These are an expensive alternative to the brass equivalent and we only use them in confined spaces. They are much quicker and an easier fit than the compression type but the price is still very high. They need to come down to a more realistic price level before we will use them on a regular basis."