![Scubapro DIN retaining knob O-ring installation bullet tool](https://scubagaskets.com/wp-content/uploads/2022/03/Scubapro-bullet-tool-e1638033908100-300x300.jpg)
Scubapro DIN retaining knob O-ring installation bullet tool
Scubapro DIN retaining knob O-ring installation bullet tool
The sharp threads of DIN retaining knobs can damage the new O-ring if pushed over these threats. Using this tool prevents any damage to the new oring.