The CPSL plug ends are pressed with a male end on the duct side to blind it at air tightness class D. The plug end rim is long enough to easily secure it with WGO screws without any risk of cutting the gasket's double lip.
CPSL plug ends are equipped with a stop fold which prevents inserting the fitting too deep into the duct.
Safe edges (rolled edges) allow the duct installer safer installation of the ductwork, by minimizing the possibility of cuts.
