An electrofusion end cap is a fitting that seals the termination of a polyethylene pipe by using an integral electric heating coil to melt and fuse the cap directly onto the pipe, creating a permanent, leak-proof closure.

An electrofusion reducing coupling connects two polyethylene pipes of different diameters in a straight line by using an embedded heating coil to melt and fuse the fitting to both pipes, creating a strong, leak-proof transition.

An electrofusion reducing tee connects three polyethylene pipes (one branch line at a reduced diameter) by using an embedded electric heating coil to melt and fuse the fitting to the pipes, creating a leak-proof joint.

A gasket seals the joint between two surfaces to prevent leakage of fluids or gases.