Compatible model:gmp050-3,gmp075-3,gmp075-4,gmp100-3,gmp100-4,gmp100-5,gmp125-4,gmp125-5,gmp150-5,gmpn060-3,gmpn080-4,gmpn100-4,GMT070-3B,GMT070-3a,GMT070-4,GMT090-4,GMT090-5,GMT090-4b,GMT115-5a,gms80904bn,gms80704bnba,gmes960803bn,gmh950703bxac. Differentiating the type of equipment prior to installation.Remove both access panels.Cut the white jumper wire between pins 1 and 4 of the 9-pin connector for GMP and GMPV series units?Do not cut the white jumper wire for GMPN and GMN series units.After installation indicator light appears OFF, check for valve failure, LED blinks 2, test if pressure switch is open.