nI was able to open your model however I am limited to the Academic version for 19.2 and your mesh has over 80,0000 nodes, so I can't solve it. I might try to remesh the gasket to use fewer nodes and see if I can get the node count < 32,000. The gasket is sweepable. n

The part with the edge that presses on the gasket could be sweepable if you had repaired the body in SpaceClaim to remove the two extra edges.n