â¦about tires, XL really means extra load. These tires can use higher air pressure to support more weight than a standard tire of the same size. If you want to see whether your current tires are standard or extra load, you can check the service description on the tire's sidewall. An extra load tire willâ¦.
Plumbing vents which have been accidentally closed off or blocked: some plumbing vents include a. screen which can slide down, closing off the vent and causing sewer gas backups in the building. We've. also found plumbing bents blocked by wasp nests, birds, and once even a frog.
In modern plumbing, a drain-waste-vent (or DWV) is part of a system that removes sewage and greywater from a building, and regulates air pressure in the waste-system pipes to aid free flow.t the building drain system's lowest point, the drain-waste vent is attached, and rises (usually inside a wall) to and out of the roof. Waste exits from the building through the building's main drain and flows through a sewage line, which leads to a septic system or a public sewer.