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Well see that's not a normal service plumbing scenario. No need for a drain in my case because first service call is diagnosis, I add air to get them by till we return. Upon return just shut cold to heater, drain some from the bottom of the heater and the air I added last time will empty the tank for me.
Even when I was a service plumber I installed a valve and a drain. but there is many ways to skin a cat.
 
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