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Weller Piston O-Ring


I have the Weller SA21A desoldering pump and I his vacuum isn't so power anymore. I bought a new one but I would like to repair and my old one. I measured the O-ring from the piston and the dimensions are below. Do you know if these O-rings are made from some certain material or they are just a regular O-ring? I didn't find any official replacement form Weller. The only spare that I found is the desoldering tip (Part Number: SA21A1).

Inner Diameter: 13,5mm
Outside Diameter: 18,1mm
Thickness: 2,5mm


That size appears to be a standard size o-ring.

You can source them from places such as this.


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