A sturdy split ring made of yellow LD polyethylene. When placed around a cylinder near the top, it protects against breakage if the cylinder is upset. Position of the ring can be adjusted to avoid contact with the top of a receiver when the liquid is poured from the cylinder. The diameter ranges given below indicate the best fit with rings. Should a ring become loose after prolonged use, soak it briefly in hot water (90°C) to return it to its original shape.
Fits cylinder with O.D. of 28.5-31.0mm (100mL)