On 20/06/2012, at 2:42 AM, Andy Glines wrote: > > It sounds like you are describing the cover on a Manzel lubricator. > http://www.ibhs.co.uk/Heritage-Steam-Supplies/Lubricators/Manzel-Lubricator-Sight-Cover/p-297-335-947/ > Close, same priciple but they are a little different. Russell