$46.06
This 54 mm long spring (Part #490077) is a replacement part made for two popular Pfeiffer vacuum pumps: the DUO 250A and the DUO 255M (Index C) . Inside your pump, this spring stores and releases mechanical energy. That is a fancy way of saying it pushes and pulls other parts so everything works the way it should. If you are rebuilding your pump or fixing a performance issue, this is the correct spring
Spring, 54 mm Long, DUO 255m, Pfeiffer, DUO, Part# 490077
Spring, 54 mm Long, DUO 255m, Pfeiffer, DUO, Part# 490077
This spring is designed to store and release mechanical energy. Let me explain what that means in plain English.
Inside your pump, there are parts that need to stay in contact with each other. They need to push together or pull apart at just the right time. The spring provides that force. It pushes when it needs to push. It pulls when it needs to pull. All of this happens many times per second while your pump is running.
Without the right spring, those parts cannot do their jobs. Then your pump cannot create good vacuum pressure. It might make strange noises. Or it might stop working altogether.
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