Similar to WB-18

4W-B - Four Wire, Base mounted smoke detector
4WA - Type 4 White Ash Lumber
4WALB - Four-Wheel Anti-Lock Brakes
4WG - 4-pass Wet-back fire tube Boiler with Gun Burner
4WN - Four-port Wall plate, Nylon
4WP - Four-legged Work Platform
4WP - Four-inch Wellpoint Pump

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