Made from a grey PVC, we also sell an adaptor for RHS to 100mm PVC pipe. The adaptor fits inside the RHS and over your 100mm stormwater pipe, only requiring installation.
We have these to suit both the 150mm x 100mm and 200mm x 100mm RHS made from PVC and 125mm x 75mm and 150mm x 50mm made from PETG.
All RHS adaptors are easily secured using adhesive.