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Thanks, The plot thickens
I tried using 2 isolated and that didn’t work.
I do have a few related posts going that ive just realized are related. You commented on my “easiest warm WUR adj in the road” and thought that a simple on off valve shouldn’t work with modifying pressures. But what I’m thinking is that it SHOULD,… EXCEPT the vacuum once applied to the WUR cannot release. It should, through the top port and the number 1 nipple.
Maybe your WUR experiences what mine does so that if you apply test vacuum to the lower WUR it will hold vacuum indefinitely until the seal is broken. I’m thinking this X manifold valve you found reaches tru atmospheric at some point allowing the diaphragm to fall and control pressure to fall.
I will hunt for your nipple X, but try testing your WUR and keep an eye on my 089 WUR vacuum testing pst. I’m hoping Tony chimes in soon, as he rebuilt my WUR and he should know how these should be tested and behave related to the vacuum
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