When installing liner and branch pipes, compressed air is always used. You also use vacuum for branch pipe installations. Sacpro sells several products for compressed air and vacuum that facilitate installations. In stock we have, among other things:
Sactools Press Vacuum Box
Used to facilitate the installation of branch pipes. Allows you to switch between pressure and vacuum with one single lever.
A small and precise precision regulator as optimized for low pressure installations.
Small, flexible vacuum pumps, either for fixed mounting or for carrying.