Plastic is best for this use… and generally they last a long, long time. That said I have a one from the forward head from 411 model that is for sale, was hardly used.
Jeffrey Schwartz
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I would imagine that with the tank being below decks and not subject to UV degradation that life would be 20+ years
Mark J Wilme
Mark....@gmail.com
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We installed a Bronco too
Thicker wall sizes than Todd
Put top mount fittings only (gravity and holding tank contents are not for me) with 'dip tubes for separate macerator discharge and deck pump out
Also added port and starboard 3/4" vents for crossflow
Mark J Wilme
Mark....@gmail.com
Sent from my android powered xoom tablet.