Multiquip 0631211159 Flooding Cap with O-Ring

The Multiquip is a genuine OEM Flooding Cap with O-Ring designed for Multiquip QP-series trash pumps and centrifugal pumps, including QP2TH, QP2TK, QP2TB, QP2TZ, QP3TH, QP3THX, QP3TK, QP3TS, QP3TZ, QP3TB, QP4TH, QP4TK, QP4TKT, QP4TB, QP4TZ, and QPT405SLT models. As a genuine OEM component, it is manufactured to the exact specifications required for proper pump priming and sealing performance. The included O-ring ensures a leak-free seal right out of the box, so there is no need to source additional hardware. DHS Equipment stocks this part to keep your pump operating between jobs without unnecessary delays.

Key Features

• Genuine OEM Sealing Integrity — Manufactured to the exact material and dimensional specifications required for consistent compression and leak-free performance on Multiquip pump housings.
• O-Ring Included — Comes complete with the mating O-ring, delivering a ready-to-install assembly that seals properly without additional components.
• Broad QP-Series Compatibility — Confirmed fit across QP2T, QP3T, and QP4T trash pump and centrifugal pump models, covering a wide range of Multiquip Quick-Prime pump configurations.
• Protects Prime and Suction Performance — A damaged or missing flooding cap allows air intrusion into the priming system, leading to loss of suction and failed pump starts. This cap maintains the sealed environment the priming system depends on.
• Direct OEM Replacement — Part number 0631211159 cross-references directly to the original cap assembly, ensuring a drop-in fit with no re-drilling or modification to the pump housing.

The flooding cap is a critical priming-system component on Quick-Prime trash pumps and centrifugal pumps. It seals the flooding port on the pump casing, allowing the priming chamber to build the negative pressure needed to draw water into the pump volute before startup. The O-ring seats against the pump body to prevent air from bypassing the seal. When the cap is cracked, cross-threaded, or missing its O-ring, the pump loses the ability to hold prime — resulting in dry running, cavitation, or a complete failure to self-prime — making prompt replacement essential to restoring full pump output.

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.