Matt@TYGA wrote:It's nice to be able to fit them dry (with just a bit of grease on the gasket), but the insulators (unless brand new) don't seem to be very clever, so best use a bit of sealant on all faces. Best to be a bit messy with no leaks than nice and clean and leaking which will lead to a seizure.

And wise to follow kan3's advice and leak test it.