1/2" Pressure Drop Activated Trap Seal Primer

MR-500-NPB MIFA Trap Seal Primer

The MIFAB MR-500-NPB Trap Seal Primer is a precision-engineered, pressure drop-activated primer designed for commercial and industrial plumbing systems. Constructed from lead-free brass, it provides consistent and maintenance-free performance under demanding site conditions. The MR-500-NPB ensures trap seals are properly maintained to prevent sewer gas infiltration in floor drains, even across multiple drain points, without requiring adjustment or pre-charging.

Technical Specifications

• Model: MR-500-NPB
• Manufacturer: MIFAB
• Type: Pressure Drop Activated Trap Seal Primer
• Series: M-500
• Material: Lead-Free Brass
• Inlet Connection: 1/2" MNPT
• Outlet Connection: 1/2" FNPT
• Length: 4-1/8"
• Diameter: 1-1/4"
• Activation Pressure Drop: 3 PSI
• Operating Pressure Range: 20 – 80 PSI
• Temperature Range: -40°F to 450°F
• Service Capacity: Up to 6 floor drain traps
• Design Features: Four view holes and removable filter screen for easy inspection and maintenance

Professional Notes

All MIFAB M-500 Series trap seal primers are engineered for straightforward field service. The assembly can be fully disassembled without performance compromise, allowing for filter screen replacement and O-ring inspection. The O-ring seals are tested to ensure long-term reliability under thermal variation and system pressure fluctuations. No field adjustments or air pre-charge are required for operation.

Summary

The MR-500-NPB MIFAB Trap Seal Primer delivers a durable, field-serviceable, and adjustment-free solution for maintaining trap seals in professional-grade drainage systems. Engineered for long-term performance and code compliance, it meets the demands of commercial and industrial installations where reliability and ease of maintenance are critical.