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[husky 555]

I believe the ball value that is plummed in the supply line from the dhwt to fill my owb  has gone bad.  Normally, I have to turn on two ball valves, the one on the front of my owb (a) and the one that is located on the supply line leading from the dhwt (b).  When I turned valve a on and water started flowing I initially, thought I forgot to turn off b the last time I topped the water off.  When I went to look a ball valve b I noticed it was in the off position.  So my conclusion is that I have a bad ball valve namely b.  Though it is not an immediate problem I would some day like to replace the faulty ball valve.  My question is how to replace it without getting water all over the place or should I just plan to wear swim trunks when I attempt this job.

[Chicken farmer]

Turn the water off to the house (well or city supply), turn on a faucet to purge the pressure from the system, swap out the valve, turn on the supply valve (leave the faucet on to purge air and eliminate water hammer action). Open cold beverage. Done.