100% waterproof and leakproof. Hygienic, easy to fit and easy to clean.  The Proclad Aqua internal corner piece is the best way to finish rough edges where two Proclad panels meet to form an internal, 90° angle. Finishing with a corner piece creates a more aesthetically pleasing and hygienic joint as compared to sealant alone. Like all Proclad materials, these internal corner pieces are 100% leakproof and waterproof when installed according to instructions. They feature the uPVC construction that guarantees consistent strength throughout. Corner pieces are easy to install with moderate DIY skills. Place the flat edge against the leading edge of the first Proclad panel already in place. Insert the second panel into the integrated slot to install it flat against the wall. That is all there is to it. You now have a clean and watertight joint with no exposed edges to collect dirt and debris. Note that these pieces are intended for use with 2.5 mm Proclad aqua PVC panels. Proclad PVC panels are hygienic, easy to clean, and easy to work with. They come backed with a 10-year guarantee and our no hassle return policy. First time buying wall cladding? Learn more and compare products here.