Dave, the only thing special about them is that they're Viton rubber, as it's pretty much the only thing that will stand up, so unless you're interested in repeating the process every 3 months or so go for Viton.
BS225 is the size IIRC.
RRP38, changed from green to red?
Or just flushed the system? Both have a tendency to expose leaks in the system.



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