You should have 4 tank valve handles. 3 grey tanks and 1 black tank handle. 2 Grey tank handles near the main sewer outlet and another up front near the front cap. The two grey tank handles by the main outlet are for the bath/shower tank and the other is for the kitchen. The third (up front) is for a washer option. I put on a Thetford twist on gate valve on the main outlet and it not only eliminates any valve leakage while in transit from pouring out when removing the cap, but also allows me to keep both it and the black tank closed while opening all 3 grey tank valves and create one large grey tank. We have a Truma tankless WH and it comes in handy for that.
The residential refrigerators have 2 shutoff valves, one is usually at the base of the refrigerator and in our 330RSTS, you have to remove the drawer under the oven to reach it. I expect your 338RETS is the same. To know for sure where it's located, with the kitchen slide extended, look under that slideout to determine what side of the refrigerator the water line penetrates the floor near the refrigerator and that is where you will find that shutoff. The second one is usually under the sink because it T's off the cold water line for the sink. Ours is behind a false panel that we have to remove two screws to get to. Once you have water running, also make sure the ice maker is turned on by removing the cover for the ice bucket and check the on/off switch.
As for the SaniCon, sorry can't help you there.
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2018 GMC Sierra 3500HD Denali 4WD LB SRW 6.6L Duramax
2017 Jayco Eagle 330RSTS
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