It is used to test single straight, U-shaped tubes, or tubes with only one end open; the kit is composed of an air gun and a tube plugging gun (in case of tubes open at both ends) .

They have been conceived to pneumatically test the leakage of the smallest hole. They weight 1 Kg (2.2 Lb) approx.as they are made in aluminium; they make it possible to test tubes with ID from:

G-150 : 7,1 mm to 31,3 mm (0,280" to 1,230")

G-150A : 31,4 mm to 64,3 mm (0,231" to 2,531") .

After making the gaskets of both guns expand simultaneously and after the pressure has stabilized inside the tube, every small leakage is easily detected.