Quote Originally Posted by Ian M View Post
Oh what do I know? I'd better leave it to the experts. Think it's time I faded back into the background with some of the others again.
Well I do think they are supposed to be filters, I have seen them before with filter material in them. But the ones supplied definitely do not have any filter material in them and do no seem to come apart to install any so I can see no advantage to using them over just removing the bung! Mine are sat in my draw for just that reason. Anyway Ian we all lurk in the background and just pounce when necessary.