Armstrong bucket steam traps are a robust mechanical steam trap available for pipe sizes from 1/2" to 2-1/2". Bucket steam traps are widely used on both low-pressure steam heating systems (15 psi and under) as well as higher steam pressures up to 950 psi. The trap's simple design is a unique leverage system that multiplies the force provided by the bucket to open the valve against pressure. They feature stainless steel valve and seats. There are only two moving parts in an inverted bucket—the valve lever assembly and the bucket. The trap opens and closes based on the difference in density between condensate and steam. It is recommended to replace the trap's internal valve mechanism and cover gasket every five years to ensure proper steam trap operation.