The housing is available in bronze or 316 stainless steel. Model U Check Valves are similar to Model A units but are only available with a spring-actuated check valve for tank sealing. What makes Model U units different is that they fit directly onto existing ullage pipes. The U valve assembly is used instead of the existing ullage hatch. They also support oxygen sensing functions.
All valves are custom made to fit existing ullage pipe hinges.
See the Required Dimensions Chart section for a dimensional diagram and chart that will allow you to fill in and fax the details of your tanks existing Ullage hatchcover mounting dimensions to MMC for a quotation.