WB TYPE J & JD Series

Drainage Floor Hatches

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Williams Brothers - WB Type J & JD Series Drainage Floor Hatch | Door

Rugged, Steel Floor Hatch with Diamond Plate Cover and Drainage Channel!

This rugged drainage floor hatch is available with either single or double leaf covers that are constructed of 1/4″ (6.35mm) diamond pattern plate and reinforced for a 300 lb/ft2(1464 kg/m2) live load. door features reinforced composite spring tubes, heavy forged brass hinges, and zinc plated/chromate sealed hardware. By Bilco.


  • Cover: 1/4″ Reinforced Steel Diamond-pattern Tread Plate
  • Frame: 1/4″ Steel Formed Channel Frame with Full Anchor Angle Welded Around the Perimeter (1-1/2″ drain coupling is welded under the frame for a pipe connection to a dry well or disposal system)
  • Finish: Alkyd Base Red Oxide Primer
  • Latch: Type 316 Stainless Steel Slam Lock with Fixed Interior Handle and Removable Exterior Turn/Lift Handle (latch release is protected by a flush, gasketed, removable screw plug)
  • Hinges: Heavy Forged Brass Hinges with 3/8″ Type 316 Stainless Steel Hinge Pins
  • Lift Assistance: Compression Spring Operators Enclosed in Telescopic Tubes
  • Automatic Hold-open Arm: Automatic Hold-open Arm with Grip Handle Release
  • Hardware: Zinc Plated/Chromate Sealed
  • Loading: 300 psf (1465 kg/m2) Live Load


  • Doors: Double-leaf Available
  • Custom Sizes: Available on Request

Models Available

  • J-1 Steel – 24″ x 24″
  • J-2 Steel – 30″ x 30″
  • J-3 Steel – 36″ x 30″
  • J-4 Steel – 36″ x 36″
  • J-5 Steel – 42″ x 42″

Manufactured by Bilco for The Williams Brothers Corporation of America. MADE IN USA.