Plumber, plumbing, garbage disposal installation. Garbage Disposal 3/4 Hp Replacement. Upon arrival customer stated that their garbage disposal was only making a humming sound. Upon diagnosis I found that the grinder plate was broken. Replaced the garbage disposal with new one. Checked for leaks and proper operation. OK. Kitchen Sink Trap Repair/replacement while doing the garbage disposal replacement I found that the satin brass waste arm had a leak in it. Cut the copper waste arm to a good spot, installed a mission band for that pipe and finished the drain with new PVC and p trap kit. Checked for leaks. OK.