RK25 3rd function install solenoid gasket. 

This one's narrowly focused: an RK25 owner installing a third-function kit specifically clears up where a mysterious square gasket goes (behind the diverter valve wiring mechanism, to keep moisture out), since other videos left him confused. It also flags a manual discrepancy about hose fittings being straight vs 90-degree elbows. Useful for someone mid-install on the same kit hitting the same confusion, not a full walkthrough.

Posted by the Farmer Homestead- Kevin Farmer channel, an owner documenting his own hands-on install and troubleshooting.