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Hi all, I've recently helped a friend remove some 'dead legs' from the radiator circuit on an open vented system. In order to carry out the above work we needed to partially drain down the heating system (upstairs only). Question, do we need to add any inhibitor when refilling the system...

Hi Guys, Just a quick question. When plumbing a cold feed for a dishwasher, do I need to use a check valve (and if so would a single check valve suffice)? Many thanks.