Shur-Lock Spreader Tool (4.00") — an installation aid recommended for large-diameter Shur-Lock II couplers. Designed to spread the coupler tabs for easier conduit insertion (recommended sizes: 3\", 4\", 6\"); reduces installation time and effort, ensures proper seating of the O-ring, and is constructed for repeated field use. Listed as a recommended accessory in Dura-Line Shur-Lock II documentation.