Ermetic drain connectors guarantee a perfect seal thanks to the tapered tang and watertight rings, ideal for connecting roof membranes with drain connectors. Compatible with synthetic TPO membranes. Ermetic drain connectors are used to connect roof membranes with rainwater drains. The slightly conical-shaped tang facilitates installation in rainwater pipes. The elastic material from which they are produced guarantees a long-lasting seal. Knurling at the top of the tang ensures a perfect attachment of the Leaf-Excluders and Gravel-Excluder to the drain connector.