They are used to measure the volume of the LP-Gas in the tank mechanically. They are of various sizes depending on the diameter of the tank.
1) Art-2025 Tube Length : 82 cm (Aprrox.)
2) Art-2535 Tube Length : 120 cm (Aprrox.)
Approximate Weight : 2,5 Kg
Inlet connection or Tank : 1" NPT