Your Becker U4.40 pump is an oil-lubricated pump. It uses oil to seal and cool the inside parts. That oil is great for the pump. But when the pump pushes out air, it can push out tiny oil mist too.This Exhaust Filter stops that oil mist. It is an oil separator. It catches the oil before it leaves the pump. The clean air goes out. The oil stays insideĀ .
We kept this simple. This Part# 96541400000 is designed for the Becker U4.40 pump modelĀ . It fits all these versions:
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U4.40 (Standard)
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U4.40 Index A, Index B, Index C
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U4.40/0-25 and U4.40/0-25 Index A
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U4.40/0-56 and U4.40/0-56 Index A
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U4.40/09 and U4.40/09 Index A, Index B, Index C
The official Becker name for this filter is “U4.40-33” 
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