Spring kit for 1784, “A” Spring Range, 5 to 55 PSIG (.34 to 3.79 BARG) delivery pressure 1784 “B” Spring Range, 40 to 110 PSIG (2.75 to 7.58 BARG) delivery pressure Spring kit for 1784, “C” Spring Range, 100 to 200 PSIG (6.89 to 13.78 BARG) delivery pressure, Spring kit for 1784, “D” Spring Range 175 to 300 PSIG (12 to 20.7 BARG) delivery pressure