Replaced my OFHG. Used a new Viton gasket. ECS still has them. They're pricey, but I'll likely never have to replace it again. If you're considering getting one, I'd do it now. the price has jumped considerably. The one I took out was hard, stiff and flat. It had been leaking for quite some time. Not a lot, just seepage. Lots of oil and dust stuck to the block. No active drips.