Manufacturer
Betts — Technical Data and Manuals
Betts' installation and maintenance manuals and engineering bulletins for its valves, manholes and vents.
Betts' technical library: installation and maintenance manuals and dated engineering bulletins for its cargo tank equipment, including internal valves, manholes and covers, vapor vents and hydraulic hand pumps.
Open it when you need the manufacturer's document for a Betts valve, manhole, vent or pump. Check the bulletin list for anything issued on the part.
Download the current copy from Betts' site.