Multiquip 0631211100ASSY Flooding Drain Cap with O-Ring

The Multiquip 0631211100ASSY Flooding Drain Cap with O-Ring is a genuine OEM component designed for Multiquip centrifugal pumps, trash pumps, and water trailers including the QP303B, QP2B, QP2H, QP303H, QP402H, MQ62TK, MQ62TDD, and QPT and QP series pump models. As a direct OEM replacement, this drain cap assembly delivers the exact sealing performance required to maintain proper pump operation under working conditions. The included O-ring ensures a secure, leak-free seal at the drain port, protecting the pump housing from unwanted flooding or fluid loss. Sourced directly from Multiquip, 0631211100ASSY meets the same specifications as the original factory-installed component.

Key Features

• Genuine OEM Sealing Integrity — Manufactured to the exact compression and material grade required for a flooding drain cap, ensuring the O-ring seats correctly and holds a leak-free seal under pump operating pressure.
• Complete Assembly — Supplied as a cap and O-ring assembly, so you have everything needed for a full drain port service in a single part number.
• Broad Fitment Across Pump Lines — Compatible with QP303B, QP2B, QP2H, QP303H, QP402H, MQ62TK, MQ62TDD, QPT405SLT, QPT305SLT, QPT205SLT, QP305SLT, QP205SLT, and WT5 and WTE5 water trailer models.
• Protects Pump Housing from Fluid Ingress — A properly seated drain cap prevents unintended flooding of the pump casing, helping maintain prime and protecting internal components from contamination.
• Drop-In Replacement — Matches the original drain port thread pattern and cap profile, so installation is straightforward with no machining or modification to the housing.

The flooding drain cap seals the drain port on the pump casing, preventing water or pumped fluid from escaping or back-flooding into areas of the pump where it can cause damage or loss of prime. The integrated O-ring provides the compression seal that keeps the connection fluid-tight during operation. When the cap is worn, cracked, or the O-ring has deteriorated, the pump may lose prime, leak at the drain port, or allow contaminants into the casing — all of which reduce pumping efficiency and can lead to premature wear on internal components.

For questions about fitment or to confirm this part is correct for your specific unit, contact the DHS Equipment team before ordering.

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.

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