TOSOKU Rotary Mode Select Switch DPP02-0-20-J-16R 15-deg step, 20 position

According to data sheet from manufacturer: this rotary switch is DPP02 020J16RWith the small screws the starting and end positions can be adjusted. DP-series with waterproof adapter (the aluminum disc with double sided tape)Code Type: Complimentary Binary Code Step angle: 15 degreeLength of shaft: 16mmWhat’s the difference between DPP and DPN?DPP has the waterproof adapter (the aluminum disc with double sided tape)