I found that with my mag drives when I use them inline (not submerged) that it was not a bad idea to just take a wee bead of silicone around the seal of the impeller housing. Easy to enough to peel off in case you need to get into the impeller housing (which really isn't all that often in most cases), and it makes the seal somewhat more effective.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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