John Mastro Plumbing Inc John Mastro Plumbing Inc Listed in Air Conditioning Contractors & Systems - Listings 5823 E Harvard AveFresno, California 93727 (559) 252-2900 Claim Listing Flag Listing Overview Map & Directions Contact/Other Phone (559) 252-2900Listing Category Air Conditioning Contractors & Systems - Listings Please login to claim this listing. Username*: Email*: Password*: Log in | Lost your password?