What size?

Always good to have an extra plug but thirteen bucks for a bent piece of metal?

There are diffrent ones, look up the make and model of your heater and match it. I use a short extention on my socket.

I would try the socket first as I did but it was a no go,So I went with This One and it worked out very well.

The wrench that comes with those plugs has two different sizes. I would think that implies there are two different size plugs out there. At least on the outside. The inside diameter of the drain may be the same on all water heaters. I increased the bend angle on that tool and it worked just fine. Channel Lock pliers have worked also.

I have always used the 15/16th socket, with a small extension.

The Threads are usually 1/2 inch IPT. Atwood normally uses a plastic plug I suggest a six point socket (not a 12) on this plug. Suburan normally uses a metal plug with an anode rod. this one can take any kind of wrench.

page 2: Keep a short length (like 6 to 10 inches) of plastic irrigation pipe, also 1/2 inch thread With water heater cold and pump /city water off. pull plug, thread in pipe open TPR valve to drain (Stand back) pipe takes water out past side of RV. Need not be all that tight. Finger tight will do.

From the 4 trailers I've owned from various manufacturers, 1 1/16" socket has removed the anode to drain.

kellem wrote:
From the 4 trailers I've owned from various manufacturers, 1 1/16" socket has removed the anode to drain.

Suburban uses a 3/4" NPT anode that uses the 1-1/16" socket. Others use a 1/2" NPT plastic drain plug with the smaller hex.

I might add that the tool maker mentioned in the original post has no clue, photos, descriptions and measurements are incorrect.

kellem wrote:
From the 4 trailers I've owned from various manufacturers, 1 1/16" socket has removed the anode to drain.

Same here, all were Suburban heaters.

My Suburban also uses a 1 1/16" socket.