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Thanks all for your input here.
Faye from Lunt sent me the following very handy information.
"We send 2 sizes of o-rings as we have found that there can be some variation in the PT module. It can be very slight but some units will benefit from using the larger o-rings. This would be determined by the seal you get from the smaller set. If you feel it could be tighter then you can employ the larger o-rings.
You can also do a progression on the plunger and use both sizes. If you would like to do this here's how. Install the smaller ring on the outer groove of the plunger and the larger ring on the inner groove of the plunger. I have attached an image just in case. The grease can be applied directly to the o-ring."
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