One size fit variations of inside diameters, such as Schedule 40 or 80, CTS or IPS, thin wall or thick wall pipe/conduit.
No need to keep extra sizes on the truck or cut them to fit, risking injury.
The inserted pipe easily slides into the host since they are made from a high-performance nylon.
A slit running along the length of these allows you to quickly squeeze and slip them into the opening of the host pipe, no tools required. Spring tension keeps the trumpet in place during pipe insertion.