OATEY 11910 3 in. Thermoplastic No-Calk 11 in. x 15 in. Base Roof Flashing

Yes. The 11910 is sized for 3 inch pipe. The flashing slides down over the vent stack and the rubber collar seals against the pipe, so no caulking is needed at the penetration.

Up to a 45 degree pitch. The base is shaped to lay flat under shingles on anything from a low slope up to 45 degrees; steeper than that and you need a different flashing style.

No. The 11910 is not for hot-mopped or built-up roofs. The hot asphalt and the mopping process are not compatible with the thermoplastic base, so on a built-up or torch-down system you need a metal or lead flashing instead.

Yes, it is approved for Type B installations and rated for 180 degrees F continuous heat, which is what lets it sit against a Type B vent rather than only a plumbing DWV stack.

The base measures 11 by 15 inches, so you get a full shingle course of coverage around a 3 inch stack. Slide the upper edge under the course above and lap the lower edge over the course below.

Don't. Paint and petroleum based products are not to be used on the plastic base or the rubber collar; they attack the material. The base is a rigid black thermoplastic and the collar is non-fading, so both hold their color without paint.

A no-calk unit like the 11910 seals with a rubber collar that grips the pipe, so there is nothing to caulk and nothing to re-seal later, and the rigid black base is non-fading and non-cracking. Lead or metal flashing is the choice where you have a hot-mopped or built-up roof, or a heat load above the 180 degree F continuous rating, since the plastic base is ruled out in both cases.