We have a 50s ranch in Florida with a galvanized 11/2" vent pipe for the kitchen sink. The boot on the roof is shot, is there a boot still made to fit 11/2" pipe?

Hi Longrider...

You're in luck, home depot sells roof boots that accommodate 1.5"-3" pipe... see picture below.

Check out this link for more info.

Oatey 1.5 In. To 3 In. Thermoplastic All Flash No-Calk Roof Flashing - 11937 at The Home Depot

Mark

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Mark gave you one. Here's another, (see image) check it out at:
1/2" to 2" Conical TPO Plumbing Boot (1)
Good luck, Tom