Abstract: Adaptors for use with snakes/adaptors locating offsets or main lines in pressurized natural gas systems and methods of making/using the adaptors are described. The snake adaptors contain a stub pipe, a fitting, a bushing, and a cap compressing the bushing around a snake, forming an air-tight fit between the bushing and cap and between the bushing and snake. The snake adaptors help locate a gas main by closing the gas valve, attaching an adaptor to the gas valve, opening the gas valve, and extending a snake through the adaptor and gas valve until an end of the snake contacts the gas main. The position of the snake within the adaptor is marked when the end of the snake contacts the gas main, the snake is removed from the valve, and the marked position then used to determine the location of the gas main. Other embodiments are described.