Product Description
The Bendix 801747 Cyclone DuraDrain Trailer Water Separator is a heavy-duty pneumatic component designed to remove moisture, oil droplets, and contaminants from commercial trailer air brake systems. Using an innovative cyclonic separation process, this compact device helps protect trailer brake valves, ABS components, and other pneumatic equipment from moisture-related damage and contamination.
Installed in the trailer control line, supply line, or both, the Cyclone DuraDrain uses incoming compressed air to create a spinning airflow that separates water and debris from the air stream. Collected contaminants accumulate at the bottom of the separator and automatically drain through the purge valve when system pressure is released.
By helping prevent moisture buildup, internal corrosion, freezing, and brake drag, the Bendix 801747 contributes to more reliable trailer braking performance and longer component service life. Its compact, corrosion-resistant construction makes it a practical addition to commercial trailers and converter dollies operating in wet, cold, or demanding environments.
-
Genuine Bendix Cyclone DuraDrain trailer water separator
-
Manufacturer Part Number: 801747
-
Original Equipment Part Number: 5013821
-
Bendix Model: Cyclone DuraDrain (CDD)
-
Uses cyclonic action to separate moisture and contaminants
-
Helps remove more than 90% of entrained moisture and particles under specified operating conditions
-
Automatic purge function drains collected moisture when pressure is released
-
One 3/8"-18 NPT female inlet port
-
One 3/8"-18 NPT female outlet port
-
Approximately 2.5-inch body length
-
Mounting hole spacing: 1.25 inches
-
Two mounting holes, approximately 0.28 inches in diameter
-
Suitable for compatible trailer supply and control air lines
-
Commonly installed near trailer gladhands
-
Helps reduce moisture-related brake drag and valve corrosion
-
Helps protect trailer ABS and pneumatic brake components
-
Corrosion-resistant construction
-
Serviceable purge nut assembly
-
Replacement purge nut kit: Bendix 5013824
-
Optional mounting spacer kit: Bendix 5014792
-
Designed for commercial trailers and converter dollies
-
New replacement assembly
-
Sold individually
The Cyclone DuraDrain provides automatic moisture removal without requiring a traditional desiccant cartridge. Its purge mechanism allows collected water and contaminants to drain whenever air pressure returns to atmospheric pressure, reducing routine maintenance requirements.
During installation, the separator must be mounted vertically with the purge nut facing downward. Bendix recommends positioning it between the trailer gladhand and the first pneumatic valve, at a suitable low point in the air line where water can be collected and discharged.
The Bendix 801747 corresponds to original equipment number 5013821. Common distributor references include BW801747, 745-801747, and 801747BXW.
Important product distinction: Bendix 801747 is an automatic cyclonic water separator for trailer pneumatic brake lines. Unlike conventional air dryers, it does not use a desiccant cartridge. It separates moisture and debris through cyclonic airflow and releases accumulated contaminants through a pressure-operated drain.
Before ordering, verify the original component number, 3/8-inch NPT connection sizes, and available mounting space. This product is a trailer air-line water separator, not a complete desiccant-style air dryer or conventional reservoir drain valve.
