Vent Pipe Part

Vent roof flashing, roof vent stack flashing. Don't do a bandaid with sealant - that won't work for long, and you can't just replace the rubber part. There are products that slip over the vent, such as:

The big box stores will carry vent flashing, but I've never noticed a repair product. Try a local roofing supplier - the odds are much better they'll have something that'll work for you.

Take the picture to a local roofing company that is recommended by someone you trust and see what they recommend. It makes a difference if your area is subject to below freezing temperatures or not. You can always try that black rubbery stuff they are advertising on TV that claims to repair anything, they supposedly covered a screen door in the bottom of a rowboat without any leaks, but that is only for a day, you probably would like the fix to last five years or more.

Sadly there is no replacement part other than roofing cement.

There are some fairly expensive retro fit thing but they also are made of plastic.

Colbyt

I have no problem with removing shingles. I just wanted to know the name of the part so I could search for it on Google, Home Depot, Lowe's, etc.

They're called vent pipe boots. Go to google and type "vent pipe boot". Lots of them will appear.

I'm not suggesting Amazon, but this site has photos.

They are sometimes called "Vent Pipe Collars" too.

Also look here:

They have them in the area of the store where shingles and roofing products are located.

Got my replacement @ Menards after a raccoon decided he didn't like the old one.

I should have looked at the how to videos on Youtube before I ripped off the shingles and felt in pieces to get to the flashing. Oh well, I still have some extra shingles.