Upon entry to the property, customer stated that they have a leak coming from the meter side and they have a slab leak. I informed the customer due to the age and condition of the existing gait valve that I could not properly pressure test the water system in order to get an accurate reading and this gate valve must be changed out to a new ball valve prior to pressure drop test. I informed customer that I will give a free pressure drop test after I change this valve to locate if the leak is coming from the meter side or the house side. customer did not want to move forward at this time. I did not have access to the house in order to take a picture of the water heater