Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
What is a high quality check valve ? Just wondering ? I have used all kinds and never had to perform maintenance on any of them and I have been running the one I have on my tank now for 9 years and it is as clean as it was the day it went in.. clean saltwater is running thru them not mucky dirt...
U can silicone the hole which has been done many of times or get a new 90 fitting all together which is what I do now and do what the other person said which is put ur returns towards the surface of the water so the siphon will break as soon as air hits them or plumb or cut in a good old check...