I just replaced the safety valve on my water heater. The only immediately available replacement was an inch taller than the original. It is still in contact with the water. Is it safe?
This is the exact fit replacement part (it was not in stock locally): http://www.homedepot.com/p/Rheem-PROTECH-3-1-4-in-Standard-Shank-Water-Heater-Temperature-and-Pressure-Relief-Valve-SP12574/205651345
This is the part I bought (it is taller and the temperature rod is shorter): http://www.homedepot.com/p/Cash-Acme-3-4-in-Bronze-NCLX-5LX-Temperature-and-Pressure-Relief-Valve-with-2-1-2-in-Shank-MNPT-Inlet-x-FNPT-Outlet-23577-0150/203164748
Is this replacement part adequately safe or should I go ahead and order the exact fit?