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I’ve discovered a better vent-pipe flashing made from powder-coated steel, and it has a special siliconized rubber boot.

Typically, you’ll either run into “standard”-weight cubes, which should weigh about 4 ounces for a 12-liter cube, or pricier “ultralight” cubes made of 30-denier siliconized nylon that weigh about 2 ounces for a 12-liter cube.

Siliconized acrylic caulk is somewhere in between: easier to apply and more flexible than pure acrylic, but still not as flexible as pure silicone.

January Colbert, a tech spokeswoman for Color Rite, recommends this product over the tinted, sanded siliconized acrylic caulks that her company also makes because Color Sil is 100 percent silicone.

I only use plumbing vent flashings that have a special siliconized rubber boot that lasts for many decades.