Multiquip 212400000 Fill Cap with Gasket

The Multiquip 212400000 Fill Cap with Gasket is a genuine OEM component designed for MQD2HA, MQD3HA, MQD2H, and MQD3H diaphragm pumps. As a direct Multiquip OEM part, it is manufactured to the same standards as the original, ensuring a correct, secure fit without modification. This cap and gasket assembly is a critical fluid-sealing component that keeps your pump operating as intended in demanding jobsite conditions. Confirm your model code against the fitment list before ordering to ensure compatibility with your specific diaphragm pump.

Key Features

• OEM Seal Integrity — Genuine Multiquip construction ensures the gasket material and cap tolerances match the original spec, maintaining a proper fluid-tight seal.
• Drop-In Replacement — Threads and seating dimensions mirror the original assembly, allowing the cap to seat and torque correctly on the fill port without rework.
• Broad Diaphragm Pump Fitment — Compatible with MQD2HA, MQD3HA, MQD2H, and MQD3H models, covering both standard and high-performance variants in the MQD diaphragm pump family.
• Leak Prevention at the Fill Port — A correctly seated cap and fresh gasket prevent fluid loss and contamination entry, protecting internal pump components from premature wear.
• Fluid Contamination Control — Keeping the fill port properly sealed is critical in pump applications — a degraded or missing gasket can allow debris ingestion that damages diaphragm and valve components.

The fill cap with gasket seals the fluid fill port on a diaphragm pump, preventing leakage and blocking contaminants from entering the pump's internal fluid chamber. The integrated gasket creates a compression seal between the cap and the port surface, which is essential for maintaining correct internal pressure and fluid levels during operation. When the gasket wears, cracks, or the cap is damaged, fluid can leak from the port or outside contaminants can compromise the pump's fluid, leading to reduced pump efficiency and accelerated wear on internal components.

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.