The S-series 12-volt VacuFlush pump rebuild kit by Dometic/Sealand has everything you need to rebuild or upgrade your S-series pump to pristine condition. This rebuild kit includes a 24V Whisper Motor Upgrade (385311424) for quiet flushing and maximum pump efficiency. This product is for 24V only and is not compatible with a 12V model. Please confirm pump type prior to purchase. Each upgrade kit contains: two packs of (385310076) 1 1/2" duckbill valves and one 24V Whisper Motor Upgrade Kit 385311424 - Motor, bellows, bellows clamps & O-rings for new style pumps.