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.
Â© PMA of Georgia 2010. Venting. The Drain Waste and Vent (DWV) system is perhaps the. most important part of the total plumbing system in a. building. The DWV system is for the removal of waste. water and material from the building.