We have installed dozens of 21iP with no issues. Internet monitoring a snap when set up properly. Internet Accessibility is achieved with Total Connect 2.0 which is a added cost up and above monitoring.
Teflon pipe thread tape. A thin double wrap at the bulb side of the thread and life is good. Had this problem with 4 Crafsman chain drive openers and it solved it.
4204 relay module is made to be wired into honeywell compatible panel keypad wiring and controlled thru the panels programing. Not Compatible.with Omni
Honeywell makes a 3/4 to 3/8 adapter part# 913-WH or 913-Br about $.35 per unit, that you might look at if the 3/4" hole is your option.But I agree smaller is better.
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