Type JH-20 Trap Doors - Wheel Loading Hinged Cover is steel construction, single or double leaf design, with wheel loading reinforcing and engineered lift assist for controlled cover operation. Cover is 1/4 inch steel diamond patterned plate. Lifting mechanism is compression spring operation providing controlled opening operation and checking downward motion when closing. A Hold-open arm automatically locks the cover in the open position. Hinges are heavy forged brass with Type 16 stainless steel pins. Finished in red oxide primer. Available in four frame opening dimensions.
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