Since its on the top side and its aluminum surfaces i would imagine you could get away fine with no gasket or even a light film of sealant but i also shot myself in the foot when i moved half of my household down to NC where im in the process of moving to, left my torque wrenches down there in my box. Heading down there monday to have the contractors install a larger septic and ill grab a bunch of tools to bring back. Need to torque spec the head nuts and need my feeler gauages for the valves. Want to do it right. Gasket should be in my mailbox when i get home.
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