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.
Another common source of sewer gas is a broken drain line that allows sewer gas into a crawl space, basement or mechanical area, which then seeps into the office, factory, warehouse, apartment, etc. Plugged or backed up drains can also push sewer odors back into the air. Besides the offensive odor, sewer gas can be hazardous especially over any extended period of time. Methane gas can displace oxygen, especially in a confined space, and be deadly. Hydrogen sulfide is also toxic.