Gasket 4 Bolt Exhaust Diverter Flange Web Specials This one seals a four-bolt

This one seals a four-bolt flange

If it drips with the valve fully closed

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Gasket 4 Bolt Exhaust Diverter Flange Web Specials This one seals a four-boltOverview Four bolt flange gasket for the exhaust diverter valve on HydraMaster truckmounts. HydraMaster part number 000 057 146, listed variously as Gasket, Four Hole Exhaust Diverter, Gasket, Four Hole Exhaust and Gasket, four bolt flange for exhaust diverter. The exhaust diverter is what sends engine exhaust either through the heat exchanger or out to atmosphere. Its flange joints run hot, cycle constantly, and are the joints most likely to leak on