Amazon.com: Prescott Plastics 1.5" Inch Square Plastic Plug Insert (10 Pack), White End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furnitures : Industrial & Scientific
Plumb Pak PP855-25 1/4 Inch Od Plastic Pipe Insert: Water Supply Connectors (046224855255-1)
2" PVC Pipe Insert Adapter (Insert x Socket) (White) - The Drainage Source
Amazon.com: 1401-015BC Plastic Pipe Insert Tee, 1-1/2 In. - Quantity 25 : Industrial & Scientific
Tigre USA Plastic Pipe Insert Coupling, 1/2 In. | Meadors Lumber Company
Plastic Barbed Insert Fittings for Polyethylene Pipe
Amazon.com: Prescott Plastics 1 1/2” (38.1 mm) Square Plastic Plug Insert, Black End Cap for Metal Tubing, Fences, Glide Protection for Chairs and Furniture (10 Pack) : Industrial & Scientific
JOHN GUEST SpeedFit 3/4 in. CTS Pipe Insert Fitting (25-Pack) TSI28 - The Home Depot
3" PVC Pipe Insert Adapter (Insert x Spigot) (White) - The Drainage Products Store
Flomasta White Polysulfone (PSU) Push-fit Pipe insert (Dia)22mm, Pack of 10 | DIY at B&Q
Plastic Pipe Fitting Insert Tee, 1-In. - Farmingdale, NY - Starkie Bros.
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
Black Round Plastic End Cap Caps Tube Blanking Pipe Inserts Plug Bung 12 to 76mm | eBay
Everbilt 3/8 in. Compression Sleeves and Brass Insert Fittings (2-Pack) 800579 - The Home Depot