New aluminum head designed for use with disc wheels that have tight access to the valve stems. The Aluminum 25.0 Disc pump head threads in the Silca rotating Schrader valve head.
On this new aluminum model the schrader threaded fitting is 1.2 thousandths larger than the brass predecessor. Same thread and pitch but will not thread into existing brass Silca pump schrader fittings as it is designed to do. Very disappointed with Silca for this improperly sized replacement. Not enthusiastic about having to purchase a new Silca Pump head just to work with this poorly machined version.