PT Coupling 80120v Aluminum Grooved Pipe Coupling, 20GPC, Viton Seal PT Aluminum Grooved Pipe Couplings can be used on any grooved pipe connection that does not require high pressure and heavy duty connection of a traditional iron pipe grooved coupling PT Grooved Pipe Couplings unique profile protects the seal from damage by allowing more room to expand during installation PTs Aluminum Grooved Pipe Couplings are designed for a cost effective alternative to heavy duty grooved pipe couplings The tank truck industry standard couplings feature serrated stud bolts and nuts to help prevent loosening from vibration The integrated stud bolts give the operator the advantage for a quick and easy assembly