Featuring a precision-machined body, our customizable top off valves are designed with a pitched threaded inlet interface, allowing easy attachment to hand pumps and preventing detachment during use. Their springless valve design eliminates the need to control spring forces when attaching a hand pump and incorporates a fast-acting back pressure check seal which functions independently from hand pumps. Durable, lightweight Delrin construction means these valves can withstand various rugged, cold and demanding environmental conditions. Check out our video to learn more.