What is a feature of most screw-on type valves?

A bleeder valve is a common feature of most screw-on type valves. This valve allows for the release of trapped air or pressure in the system, which can help to prevent leaks and ensure that the valve operates correctly. The function of the bleeder valve is particularly important in mobile water supply scenarios where maintaining proper pressure and preventing air locks in the lines can significantly affect performance and safety.

In addition, the unique design of screw-on valves typically facilitates easy attachment to hoses or lines, and the presence of a bleeder valve enhances user control over the system, especially during startup or maintenance. While other features like thermal relief systems or built-in gauges may be present in some valve types, they are not universally associated with screw-on type valves as the bleeder valve is.