30 PSI Pressure Relief Valve, Boiler Relief Valve with 3/4 NPT Thread, PTFE Thread Seal Tape, Brass, for Hot Water and Cold Water Systems 810-2700-1 you don't need to worry Cast iron heat distribution

30 PSI Pressure Relief Valve, Boiler Relief Valve with 3 4 NPT Thread, PTFE Thread Seal Tape, Brass, for Hot Water and Cold Water Systems 810 2700 1 you don't need to worry Cast iron heat distribution you don't need to worry about hazardous chemicals NOTE You can just turn the whole chimney such that the pivot point of the daisy wheel is facing you directly (6 o'clock) that way the daisy wheel is always "hanging down" at regardless of the angle of opening of the whole lid it won't move and your setting will stay put but our boiler relief valve is fixed at 30 PSI our safety relief valve comes with a roll of PTFE thread sealing tape