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What is the funny looking sailor cap/primer bulb on the pump for?

April 26, 2017bulb cap funny primer pump sailor

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What is the funny looking sailor cap/primer bulb on the pump for?

1 Answer

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Answer Some units have a breather cap, others have an expansion bulb. This is an expansion bulb, not a primer bulb. When gasses in the pump begin to expand, the expansion bulb will expand with the gasses, preventing seals from blowing out.