Check ball retainer. This is used to cover the check ball in the bottom of the accelerator pump well and keeps the check ball from rolling around places it shouldn't be.
Outside diameter = .5"
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Bought this and it went right in place over the check ball. No problems at all. Highly recommend this product. Thanks Mike!
Bought this for my Toyota 3k carb, it seems to fit well over the ball, the spring fitted perfekt too.??