The flush mount was the old style canister; the one that has the valve insert into the canister is the updated style. Either will work, but you have to use the correct style valve with the appropriate canister. It's possible that the seal is the culprit, but the only way to be sure is to pressure test. Probably easier to just get a new seal and replace it. With the valve off, you can make sure there is no debris stuck in it and you can component test it by apply 12v and a ground to the appropriate terminals and try blowing through it (you shouldn't be able to).
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