draining a hot water heater with no drain

[oltrunt]

Somehow I've never learned that lesson---I'll keep working at it until it IS broken and then replace it all.   Jack

[dtcerrato]

That's my moto - if it ain't broke don't fix it. Some would cringe but anyway - we've owned our only coach for 42 years & 6 months. We have never changed nor replaced the brake blocks because they exceed da book's minimum thickness, there are still a few of the original convoluted air bellows on it because they refuse to quite giving perfect service, same for a LOT of oem equipment on it so yes I agree. 

[chessie4905]

You do inspect bellows occasionally for cracking?

[dtcerrato]

Yes on bellows crack inspection. Yes on cracks on exterior surface of older bellows. Yes on exterior cracks (within reason) being acceptable by the manufacturers. Yes on the older vintage bellows being heavier & thicker than newer bellows. Blistering &/or bubble are not acceptable.