An inflatable pneumatic plug useful for expediting the hydrostatic testing of bathtub and water plumbing installations. The pneumatic plug has a semi-rigid handle tube with an air valve at one end and an inflatable tube attached to its opposite end. The inflatable tube and the handle are of sufficiently...http://www.google.fr/patents/US5581018?utm_source=gb-gplus-shareBrevet US5581018 - Pneumatic plug and method for hydrostatic testing of bathtub plumbing
Pneumatic plug and method for hydrostatic testing of bathtub plumbing
