The Plasson Compression Fit Coupler is perfectly suited for connecting water mains pipes and any water supply pipes in infrastructure, agriculture and horticulture. Used to connect both MDPE and MDPE irrigation pipes, a pipe liner is required when using this fitting with MDPE piping. Made from virgin Polypropylene for immense impact strength and stress resistance. Extremely robust and strong fitting, it is perfectly suited for outdoor use in direct sunlight and is also frost resistant. The coupler comes with a captive O-ring to create a perfectly water tight seal, making it easy and fast to install by simply tightening the grip once secured to the pipe.