Last vented loop I installed was for my kitchen dishwasher, but it's a Marelon unit purchased at Defender. I mounted the loop to the top of a piece of plywood, then screwed the bottom of the plywood to the kitchen wall. The valve is inaccessable behind the sink, but I can just unscrew the plywood and lower it for access (don't even have to undo the hoses). It has a tiny 'joker' valve in it - if it leaks, it needs cleaning. So far (5 years?) it's been untouched.