Sorry for the stupid vague question! I've tried to find out what that part pictured below is called but with no joy.
Anyhow, I was doing some work in the airing cupboard today and when I finished I noticed that the the little black plastic screw had unthreaded and come off. When I go to put it back on, do I tighten it all the way or only part way? I remember ages ago a plumber explaining something about that being used for hot air to escape, but it was a long time ago and I might have remember it wrong.
Many thanks
Anyhow, I was doing some work in the airing cupboard today and when I finished I noticed that the the little black plastic screw had unthreaded and come off. When I go to put it back on, do I tighten it all the way or only part way? I remember ages ago a plumber explaining something about that being used for hot air to escape, but it was a long time ago and I might have remember it wrong.
Many thanks