What is a double check-valve?
| How can I tell if my existing garden tap has a built in double
| Is is possible to tell just by looking at it or to I have to take it
| apart and examine the internal components?
I don't know how to tell if it's single or double, but if there's a
checkvalve in the tap, it's visible at the inlet end in my one. There may be
other designs where it's visible from the outlet end, I don't know. You'd
have to remove the tap to check, but not dismantle it.
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