Designed specifically for integration with Advanced Elements pumps, the AE4000 is a convenient inflation gauge and Spring™ valve adapter combination compatible with any Advanced Elements model (2006 and newer) featuring our proprietary Spring™ valve. To use, detach the Spring™ valve adapter from the gauge housing, connect the gauge housing in-line between your pump's T-handle and the inflation hose, and attach the Spring™ valve adapter to the other end of your hose. This setup ensures a dependable gauge reading during inflation. Alternatively, you can use the Inline valve adaptor as a handheld gauge by keeping the Spring™ valve adapter in place on the gauge housing and threading the adapter onto your kayak's Spring™ valve. For all kayak models 2006 and newer with a Spring™ valve. Fits Advanced Elements pump models AE2001, AE5001, and AE2009.