I am far from my boat and do not recall the size, but why would you want to replace one of those? With the advent of new packing materials you can be dripless by simply packing a traditional stuffing box with the "new" black packing stuff. I have been using it for about 15 years and does not drip and does not score the shaft if installed correctly. Also you could repair and adjust it in the water if you had to. I was a delivery skipper in the early 80's and had some very bad experiences with mechanical "no drip" systems breaking down offshore. Personally, I think they are a safety hazard when safer and much less expensive options are available.
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