Hellermanntyton spiral reinforced pvc conduit grey psr series hellermann tyton 166 40004 the hellermanntyton 166 40004 psr25 is a spiral reinforced pvc conduit from the psr series this conduit is extremely 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 easyideal f