What size pipe will fit with the 3 in. and 4 in. Adjustable Pipe Flashing with Aluminum Base and Rubber Collar?

This will fit over a pipe up to 4".

This will fit over a pipe up to 4". It is designed for exhaust pipes that terminate through the roof and can be used on all standard pitch roofs. The adjustable rubber collar allows for a snug fit around a 3" pipe and has a perforated ring that easily tears out to make the hole bigger for a larger 4" pipe diameter. You would need to use a sealant around the 3-1/2" pipe.