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.
Drain-Waste-Vent Plumbing Systems. Understand how your homeâs drain-waste-vent plumbing systems work with this expert illustrated explanation. The system of pipes that carries water and waste to a sewer line or septic tank is call the drain-waste-vent (DWV) system. As the name implies, it has three components: Drain lines collect water from sinks, showers, and tubs; waste lines carry waste from toilets; and vent lines exhaust sewer gases and allow wastes to flow freely.