National visible pump Indicators.
Even though the indicators look different in each picture I think they might all be the same. The picture of the single is a Dayton indicator which appears to be the same style as the National. I don't know if the National uses the same style spring tension for mounting.

National Collage.jpgNational Single.jpg
Last edited by Tim Rohr; Wed Mar 20 2013 05:29 PM.