Hellermanntyton straight connector for spiral reinforced pvc conduit psr s hellermann tyton 166 40704 the hellermanntyton 166 40704 psr20 is a connector for spiral reinforced pvc conduit from the psr s series the straight m20 connector has been manufactured from polyamide 66 pa66 with a flammability approval of ul94 v2the connector has an external thread and comes with ip65 approval for psr conduit and ip67 with psrsc conduit it is highly resistant to solvents and oils and free of hal