Suburban h2o heater anode rod head size.

1 1/16" -----6 point socket works best

Just too my old used up one out and stuck my pressure washer in the hole and blew out all the crud.

SidecarFlip wrote:
Just too my old used up one out and stuck my pressure washer in the hole and blew out all the crud.

I prefer a 'power flush'

Remove drain plug/rod, turn on water supply and stand back.
Nothing sticking in thru drain hole so water pressure BLOWS crud out W/O any obstructions .......cold inlet dip tube points downward and really stirs up the sediment on bottom of tank.

Especially Atwood which has a 1/2" drain hole (Suburban 3/4")
Stick a wand in Atwood and most of drain hole is blocked :S

As already said, 1 1/16". Many 4 way lug wrenches have that size.

27mm works too.

Old-Biscuit wrote:

SidecarFlip wrote:
Just too my old used up one out and stuck my pressure washer in the hole and blew out all the crud.

I prefer a 'power flush'

Remove drain plug/rod, turn on water supply and stand back.
Nothing sticking in thru drain hole so water pressure BLOWS crud out W/O any obstructions .......cold inlet dip tube points downward and really stirs up the sediment on bottom of tank.

Especially Atwood which has a 1/2" drain hole (Suburban 3/4")
Stick a wand in Atwood and most of drain hole is blocked :S

Not really. The business end of the pressure washer won't fit through the hole anyway. I installed a narrow spray nozzle and held it off the opening about an inch and let it rip. Blew all the stuff right out, on me and my sweatshirt and the driveway and I had a 'look see' afterwards with my bore scope and it's clean as a whistle inside.