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I think it is the operators presence switch valve body on my s800tx mini. I have replaced it (o-ring) before but I'm thinking the o-ring set I bought is garbage. The valve is really just hand tight. It's a messy 20 minute job but easy.

What are all y'all using for o-rings in your hydro systems? I have been using a nitrile o-ring but they seem to fail sooner than later. I am not sure if they are just a cheap set or the wrong material. Any good brands to use?