Plastic Barbed Insert Fittings for Polyethylene Pipe
Plastic Sleeve, Ferrule 1/4 and tube insert - Aqualogis
Amazon.com: Prescott Plastics 1.5" Inch Round Plastic Plug Insert (10 Pack), Black End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furniture Legs : Industrial & Scientific
Plastic Pipe Insert | Pipe Station
White Speed 22mm Universal Pipe Insert | Push Fit Fittings | Prestige Building Supplies