Midland Industries 39566 Gladhand Pacifier Seal

Product Description

The MIDLAND INDUSTRIES 39566 is a gladhand pacifier seal designed to protect gladhand couplings on commercial trailers and semi-trucks when they are not connected to a tractor or auxiliary air supply. The pacifier seal plugs into the open gladhand port, blocking the inlet and preventing dirt, debris, and moisture from entering the air brake system lines. This small but critical component helps maintain the integrity of the air brake system between hauls. Truck mechanics, fleet maintenance technicians, and trailer service professionals install these seals as standard practice during equipment staging and storage.

The 39566 pacifier seal is used across commercial trucking and fleet operations wherever gladhand couplings are present on trailers, dollies, or auxiliary air line connections. It is suited for both service and emergency line gladhands and is a common item kept in quantity at fleet maintenance facilities, truck stops, and trailer repair shops. The seal fits into the gladhand face to cap the port when no air supply hose is connected.

Key Features

• Seals open gladhand ports to block contaminants from entering air brake lines
• Designed for use on both service and emergency gladhand couplings
• Lightweight construction at 0.025 pounds for easy on-vehicle storage
• Compact profile with package dimensions of approximately 9.95 inches length, 3.4 inches width, and 1.35 inches height
• Suitable for commercial trailer, semi-truck, and dolly applications

Compatibility

Designed as a standard-style pacifier seal for gladhand couplings commonly found on commercial trailers and tractor-trailer air brake systems.

Installation Notes

Installation is performed by qualified truck or trailer mechanics as part of routine air brake system maintenance. Before servicing air brake components, depressurize the air system and chock the wheels to prevent vehicle movement. The pacifier seal is inserted directly into the gladhand face when the coupling is disconnected. Air brake system work on commercial vehicles must comply with applicable Federal Motor Carrier Safety Administration (FMCSA) regulations and DOT requirements.