Roof Vent Pipe Boot Base Shape Square Base Material Aluminum Cap/Collar Material EPDM Material Thickness 0.3 in For Roof Angle 20 Degrees 45 Degrees For Number of Pipes 1 For Maximum Pipe Size 18 1/2 in For Minimum Pipe Size 11 in Base Height 35 in Base Width 35 in Base Diameter Not Applicable Seal Material Silicone Top Opening Open Application Pipe Vents Product Type Residential Master Flash UV Protected Yes For Roof Type Pitched Standards IAPMO (UPC) Listed