Multiquip 0631211159 Flooding Cap with O-Ring

The Multiquip 0631211159 Flooding Cap with O-Ring is a genuine OEM component designed for QP-series trash pumps and centrifugal pumps, including models QP2TK, QP4TB, QP2TH, QP3TB, QP2TB, QP3TS. As a direct OEM replacement, part 0631211159 is manufactured to the same specification as the original, ensuring a correct installation without the need to source the O-ring separately. This cap and O-ring assembly ships ready to install, keeping your pump priming system operating as intended across a broad range of Multiquip QP-series equipment.

Key Features

• Genuine OEM Sealing Integrity — Manufactured to Multiquip's original material and dimensional specification, delivering the compression rating needed to maintain a leak-free flood priming chamber.
• Integrated O-Ring Included — Cap and O-ring are supplied together as a matched assembly, so the sealing surface is renewed in a single installation step.
• Broad QP-Series Compatibility — Confirmed fitment across QP2, QP3, and QP4 trash pump and centrifugal pump models, including QP3TK, QP4TH, QP2TH, QP4TKT, and QPT405SLT.
• Maintains Priming System Performance — A correctly sealed flooding cap holds the water charge needed to prime the pump; a worn or cracked cap causes air ingestion, slow priming, and potential dry-run damage to the impeller.
• Fuel-System Adjacent Safety — Proper cap sealing prevents uncontrolled fluid release at the pump housing during operation, an important consideration on jobsites where pump fluids must be contained.

The flooding cap is part of the self-priming system found on QP-series pumps. Before the pump can move water, the priming chamber must be filled and sealed so the impeller can generate the suction needed to draw fluid from the source. The flooding cap, seated with its O-ring, closes off the fill port and holds that prime charge in place. When the cap cracks, the O-ring flattens, or the seal fails, air bleeds into the chamber, the pump loses prime, and output drops sharply — or the pump fails to prime altogether. Replacing the Multiquip 0631211159 Flooding Cap with O-Ring restores a proper airtight seal and gets the priming system back to full function.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.