Anywhere there is a potential for contamination or pollution of the drinking water system, a backflow prevention device is required. Devices can be small and simple, such as an anti-siphon vacuum breaker (AVB) on a hose spigot (Photo), or large and complex, like those used on fire sprinkler systems (Photo).
An avulsion fracture occurs when a muscle or tendon is pulled so hard at the spot where it attaches to the bone that it tears a small piece of bone away. Avulsion fractures can occur on any part of the body, but they are most common in the ankles, hips, and elbows.
Types of avulsions[edit] Skin avulsions[edit] The most common avulsion injury, skin avulsions usually occur during motor vehicle collisions. The severity of avulsion ranges from skin flaps (minor) to degloving (moderate) and amputation of a finger or limb (severe).