ECU means Engine Control Unit in Commercial
Similar to ECU
4SR - Four-shelf door mount Spice Rack4SR-15 - Four-Shelf door mount Spice Rack, 15 inches long
4SR-18 - Four-shelf door mount Spice Rack, 18 inches long
4SR-21 - Four-shelf door mount Spice Rack, 21 inches long
4W-B - Four Wire, Base mounted smoke detector
4WA - Type 4 White Ash Lumber
4WALB - Four-Wheel Anti-Lock Brakes
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