All ductile iron tees have gasket bell ends designed to push on to IPS (iron pipe size) plastic pipe. The pipe end must be beveled and lubricated with gasket pipe lube before inserting into the gasket bell end. The vertical ears on the tee are designed to attach joint restraint products. The horizontal ears on the tee are designed to attach spigot end fittings such as SBR reducers or plugs.