winterizing unit (picture of water heater)

Thanks for all the info. Wasn't aware that my trailer had the bypass already installed and is accessed from under the bunk.

Here is a pick of the inside (just wanted to be 100 percent sure which valves are which for bypassing for the winter.

It's an Atwood heater with a nylon drain plug. Let it cool off and turn off water pump. Open a hot side faucet in the RV to relieve pressure. Then remove that big plastic nut to drain the tank. You really don't need to open the pressure relief valve, it will still drain. While the tank is draining go inside and lift the bunk to access the back of the water heater. Set the valves to the bypass position to isolate the water heater tank.

Now go back outside and put the plug back in finger tight. Put the socket on the plug and give about a 1/12th turn. Picture the plug being a clock face and turn it from the 12:00 position to the 1:00 position. That's it, there is no need to go tighter unless it seeps or leaks. Honestly 1/12th is probably still turning it more than you have to.

No need to open the T&P valve and possibly have it leak after, just open a hot faucet to relieve pressure.

...and if you don't relieve the pressure at the T&P valve at the top of the tank and the nylon plug is at face height when you take it off, will smack you right in the puss plus you get soaked....lol

That white 'nut' is actually a nylon drain plug, use a 1" socket to remove, then open the pressure relief valve and it will drain the water heater. Important have city water disconnected/turned off and water pump turned off as well as turning off the heater controls, gas and electric (if equipped). Also water temp should be cool.

Bypassing the heater for winterization is done on the inside of the RV, behind the heater. One or three valve system.

Ken

If you don't relieve the pressure, before removing the plug, you will have an unexpected shower. plus the plug comes out much easier.

Picture is huge! Need to resize.
That is an Atwood water heater. Remove the plastic plug with 15/16 socket with extension to drain. Trip the Prfessure relief valve to empty quicker.

Are you just looking to drain it? If so, you can either pull the plug and let it drain, or open your low point drains and open the pressure relief valve and it'll drain from there.

If you are looking for by pass valves for RV AF, then that would be on the back side where the lines go in/out of the tank.

Good luck!

Mitch

Looks usual to me.