E555-075-01 Magnetic Proximity Switch Assembly
Fits Better Packages BP555e model gummed tape dispensers built from 1999 - 2018. Before you go replacing this part, make sure the magnet is still in the top cover and has not fallen out. This magnet notoriously falls out making the machine inoperable. Make sure you've got a broken switch, and not a missing magnet.
In 2018 the switch was changed to the ST-3260. Compare pictures to purchase the correct switch. The new style will not work on the older machines.