Dura-Line Shur-Lock II is a plastic mechanical coupler designed to join HDPE and PVC conduit (and transition between dissimilar conduit materials). The coupling uses stainless steel band clamps and a locking ring; a pre-lubricated O-ring provides an airtight/watertight seal rated to 125 PSI. The coupler is UV-resistant, re-enterable, requires no special tools, and is ETL/UL listed for electrical/telecom installations. (Manufacturer pages were blocked; this description is compiled from distributor listings.)