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safety relief valve ?

could any one tell me how easy it is to fit a ravenheat 820/ safey relief valve , not shaw if it is a push on or screw valve , and do i have to turn the water off first , i would be very gratefull for your help ,thank you
leonard, October 2008
Hi there, yes you need to turn water off but is very easy to fit with conventional tools.

M R, October 2009
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