Old-Biscuit wrote:
There are 1 versions of the TYPE I ACME Nut
Older Version the 'thermal bushing' is fully visible
THEY Leak

Newer Version the 'thermal bushing' is not as visible
They are much less prone to leaking

ACME Nuts are designed to be 'hand-tightened' to fully seal
They have to be tight enough to open the spring loaded chutoff vlave inside the OPD Service Valve opening
Stub inside ACME Nut pushing the valve open when properly tightened
When attached to OPD there should not be any leakage from the ACME Nut
If is does....try to hand tighten more
But shouldn't be that hard
I thought I had subscribed to this thread when I first posted it, but I guess I didn't. Then I promptly forgot about it. :S
Thanks for these pics (and the other responses.) I didn't realize there were two types. Not sure which type I have, but the leaks seemed to be coming from where the pens are pointing in the pics. When I say leak, it's more like a gush. Like it's not sealing at all. I did try to tighten them more by hand, but there was no change. I didn't have a lot of time to monkey with it, and we didn't need to use the propane at the time. Sounds like my best bet is to take the tanks and pigtails to a propane dealer to let them take a look. In the meantime I'll see if I can find out which style I have now.