Oatey Master Flash roof flashings are engineered for profiled roofing materials and can be installed on all types of roofing surface, the base is designed to form a seal on any panel configuration and roof pitch, regardless of pipe location. It accommodates vibration, pipe movement caused by expansion and contraction and snow load movement. Master Flash is made of EPDM and compounded specifically for maximum resistance to weathering due to ozone and ultraviolet light.