I had the PT relief valve replaced on a RUUD gas water heater, due to several drain releases throughout the day. Since then releases continue but at lesser frequency and amounts. I noticed the plumber had installed a galvanized pipe coupler/splice between the new PT valve and the gas heater nipple inside the heater. This pushed the new PT valve out by 1 1/2" from the older valve position. Is this acceptable? Since the new valve is out further due to the pipe section, could valve temperature and pressure readings by off?