looking at geting a couple of these http://www.irrigationwarehouse.com.a...ry15_1.htm#425
but dont know whether 20mm or 25mm would be better? what ya reckon??
i wanna hook rain water to my toilet, going to use a switching mechanism using a couple of ball valves also. going to hook half of it up myself and get plumber to finish it off to save cash.
do these check valves fail or leak? is it ok to put these inside of a wall or in the top of the roof safely??


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