Current regulations require a number of safety features to be designed into a multivalve. These include: a non-return fill valve automatic shut-off at 80% full a pressure relief valve an electrically operated shut-off output valve. Older valves often fail to meet this specification. If your multivalve is not marked E67R-01, you should change it. You must fit a valve that matches the diameter of the tank. These valves are designed to be mounted at 30 degrees up from horizontal. These BRC multivalves come with a 0-90 ohm level sender, but without wiring for sender or solenoid valve. Select your tank diameter from the drop-down list.