"Safe-t-seal" G.T. Water products' test plug group. The plumbing industry is government regulated regarding safety warnings but not safety design. The only protection afforded to the user is that dictated by the manufactures own conscious. G.T. Water products has developed its safe-t-seal line with a concern for the user's safety. Test plugs are specifically used to pressure test water lines in new construction & in renovation projects. The safe-t-seal Brand, as the name implies, has eliminated the negative, dangerous features associated with other major brands. Safe-t-seals distinctive features include: a patented pressure release safety valve to prevent over inflation or blow-out. The pressure release valve is built in & designed to release excess pressure through the plug valve; dual inflation capability gives the user the option of air or water; a waffle-smooth body design for user. Long test plugs have two stage deflation which eliminates back wash & flooding.