Fast drain I believe. I'm now replacing mine & I just found out it's very delicate as it snapped with hardly any pressure applied (hence the cause of the continuous dripping I'm assuming.) I now need to gently saw through the plastic remnants of this plug/valve without cutting through to the metal thread's, then hopefully replace.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.