Answer
Jan 09, 2026 - 08:17 AM
Based on what we've seen, the duck bills are not included in this kit, and most Dometic / Sierra Marine S-Series and T-Series pumps 1-1/2 inch duckbill valves Part 385310076. There are 2-inch duckbill valves for some Dometic series pumps, but they're just not standard for the S or T Series, unless modified to accommodate larger fittings.
That said, if you require 2-inch duckbills (most common with J, L, B, and M-Series pumps or VG4 vacuum generators) from what we've found it appears to be the Dometic / Sierra Marine part 385311581 that would be required.
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