PPM Membrane Passing Element Water Seal The PPM Membrane Passing Element Water Seal is designed to protect and prevent moisture from entering the insulation at the point where the ventilation outlet passes through the membrane. Thanks to the water seal ring, you can ensure the long-term existence of your roof, because when using it, moisture will not penetrate into the thermal insulation, violating its properties. Mounting strips on the sides of the ring have several rows of holes for easy fastening. Characteristics Main attributes Producer KRONO-PLAST Producer country Poland User characteristics Additional equipment KRONO-PLAST Membrane water seal Material Polypropylene Color Black