US Patent 10400929 Fitting device, arrangement and method

A push-to-connect fitting assembly, device and method allows for continual contact of inserted tubing with a main body member so as to maintain conductivity for electrical applications and a tight, rotation-restricting seal. In various embodiments, an axially internal portion of the device has an interior surface that tapers from a narrower radius to a wider radius as it extends outwardly from a tube stop element to an outer rim.