The Square Vent Master Flash® Pipe Boot Flashing is designed for larger square pipes and vents, eliminating the need for custom adapters. Made of EPDM, the Square Vent Master Flash® pipe boot flashing is compounded specially in order to produce a high resistance to ultraviolet light and ozone corrosion. This pipe boot flashing also features a malleable aluminum base designed to form a seal on virtually any metal panel configuration or roof pitch.