Canister 10' blow antique hand pump

Antique well hand pump has some peculiar device 10' below ground It is like a small inline cainster. It could be a pressure modifier or a filter. What is it? Should it be replaced or should replica pump be used to substitute for both units?
&----(========================[] pump pipe unknown hose screen
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Accumulator maybe?
On Fri, 23 Jan 2004 21:57:15 +0000 (UTC), snipped-for-privacy@biostrategist.com wrote:

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snipped-for-privacy@biostrategist.com wrote:

Probably the casing for a foot valve. Foot valves (a low pressure version of a check valve) could be as simple as a circle of leather that rested on a lip around a hole. Attached just at one point, water could come in as the leather raised, but when the water would normally drain back, the foot valve would keep it in the pipe, keeping the user from having to pump air or re-prime the pump. The leather would decay over time. The canister shape was needed to form the lip.
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