This is a PCV breather valve as used on twin carbs on MG Midgets and AH Sprites and some MGB and Mini Coopers It is used but is in good condition and complete  Please look closely at all pics as these form a big part of my description. After over 35 years of Midgets and Sprites, I've decided to clear out my sheds of duplicate parts and spares that I was saving in case I'd rebuild another. I will be clearing my sheds/garage over the next few months. I will post this in mainland UK or it can be collected from Tamworth - (If collecting, please pay on collection)