Roof Vent Pipe Boot Base Shape Square Base Material Aluminum Cap/Collar Material EPDM Material Thickness 0.3 in For Roof Angle 18 Degrees 36 Degrees For Number of Pipes 1 For Maximum Pipe Size 8 1/4 in For Minimum Pipe Size 4 in Base Height 11 in Base Width 11 in Base Diameter Not Applicable Seal Material Silicone Top Opening Open Application Pipe Vents Product Type Standard Master Flash UV Protected Yes For Roof Type Pitched Standards IAPMO (UPC) Listed