A silicone ring sized to sit at the base of a pump cylinder rather than to be worn on its own: 4 centimetres across on the outside, 7.5 long. It is elastic enough to stretch over and then stay, and smooth enough to glide on rather than drag. Simple, and specific about the job it does.
Specifications
- Material: Silicone
- Total length: 7.5 cm
- Diameter: 4 cm
Clean it with warm soapy water after use, then dry it and store it somewhere cool.



























