Air Tank Drain Valve - External Seat 1/4" NPT - Fairview 240-B Sloan SDC604-4 177.40204

Water is the enemy your air system makes for itself. This external seat drain valve distributed by FleetPro Parts & Tires threads into a 1/4 in NPT port on an air reservoir and gives you a clean, one-hand way to purge the moisture that the compressor pushes into the tanks every working day. Let that water sit and it goes where the air goes — into the valves, into the lines, and in January into a slug of ice that stops the system cold. A drain valve that will not seal, or one whose stem has seized, quietly ends the daily habit that keeps all of it out. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

Purge It Daily: The External Seat Drain Valve Advantage

The external seat is the detail worth paying attention to. With the sealing seat on the outside of the tank boss, the valve closes against a surface you can see and reach, instead of depending on a seat buried in the reservoir where the sludge collects. Combined with a standard 1/4 in NPT thread, that makes this a straightforward swap on the reservoirs and tanks already on the truck.

Fit one on each tank and drain them at the end of the day while the system is still warm and the water has not settled into the low corners. At FleetPro Parts & Tires we treat the drain valve as maintenance hardware, not an afterthought, because the alternative shows up later as a rusted tank or a frozen brake circuit. This Automann drain valve is a direct replacement for highly searched industry numbers including Fairview 240-B, Sloan SDC604-4, Tectran 108-4 and Velvac 036019, and it replaces the earlier 177.4021.

Vehicle Fitment & Compatibility

This Fleet Standard valve uses a universal design intended for the following commercial applications:

• Make/Model: Universal - Class 8 trucks, commercial tractors and trailers
• System: Moisture drainage on air brake reservoirs and tanks
• Port: 1/4 in NPT
• Seat Type: External seat

Direct Replacement & Cross-Reference Numbers:

This Automann drain valve serves as a direct replacement for the following part numbers:

• Fairview Interchange: 240-B, 240B
• Sloan Interchange: SDC604-4, SDC6044
• Tectran Interchange: 108-4, 1084
• Velvac Interchange: 036019
• Automann Supersedes: 177.4021
• Automann Distributor #: 177.40204

Technical Specifications

• Component Type: Air Reservoir Drain Valve
• Seat Type: External Seat
• Thread: 1/4 in NPT
• Service: Daily moisture purging on air brake reservoirs and tanks
• Replaces: 177.4021
• OEM Reference: Fairview 240-B
• UPC: 889626801204
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)