Hellermanntyton spiral reinforced pvc conduit grey psrsc series hellermann tyton 166 40304 the hellermanntyton 166 40304 psrsc25 is a spiral reinforced pvc conduit from the psrsc series this straight fitting conduit is flexible and allows for easy insertion of cablesconstructed entirely from pvc the conduit offers complete protection against corrosion and can be easily cut with a knife or scissors leaving a clean edge to work with and enabling the fitting of terminations to be quick and