These have a cast bronze body and a durable lever for quick action (opening or closing). Commonly used on bulk waste tanks or other areas where a large volume of fluids must be moved quickly. The heatable port valves can be plumbed in to have an anti-freeze line run through the valve in order to keep it from freezing shut in colder environments. Other sizes, replacement handles (N10300RH-BR) & rebuild parts (N10300R) are available upon request.