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The new MF-846 vent barb assembly option can be used in lieu of the standard MF-841 cap and duckbill. This option allows valveless venting - without the liabilities of a duckbill possibly fouling. Venting can be to the outside of the hull via a 1/4"(6.35mm) hose, or simply running the hose vertically toward the overhead, above any possible water level.