O-Rings for Pump to Diptube Adapter

Part Number ASD317 — Replacement O-rings for the Pump to Diptube Adapter on the Dometic/Sealand 385311317 Low Profile Vacuum Generator. Sold as a pair.

The VG3 Low Profile Vacuum Generator is the heart of the VacuFlush sanitation system found in Fleetwood RVs and select marine applications. The pump-to-diptube adapter is a critical connection point: it channels fluid from the dip tube into the vacuum pump assembly. Over time, the two O-rings sealing this adapter dry out, crack, or become deformed — especially in the harsh heat cycling environment of an RV compartment — allowing air infiltration that causes the vacuum generator to lose pressure and run continuously.

If your Fleetwood RV’s or Lowprofile VacuFlush system is cycling on frequently without anyone flushing, or if you notice the vacuum failing to hold between uses, worn adapter O-rings are one of the first things to inspect and replace. These are the factory-correct, proper-fitting replacements designed specifically for the 385311317 pump.

• Fits: Fleetwood Low Profile VG3 Vacuum Generator (385311595 pump)
• Sold as a pair (enough for one complete adapter service)
• Restores airtight seal between pump and dip tube
• Addresses vacuum loss and continuous pump cycling symptoms
• Recommended as part of any routine VG3 pump service or rebuild

Installation tip: Apply a thin layer of food-grade silicone grease — such as Super Lube® Synthetic Grease (SKU 82340) — to the O-rings before reinstallation. This eases assembly and extends the life of the new seals significantly.

Aqua Star Distributors is your specialized source for Dometic/Sealand VacuFlush parts for both marine and RV sanitation systems.