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Trinity Parts & Components offers a 20-inch, vented and non-vented low-profile hatch cover assembly in both plastic and aluminum. They feature a center-loading hold-down bar with cam-locking securement. All materials are FDA-acceptable food grade quality. The company also offers a 20-inch cast aluminum hatch cover assembly that is rated at 25 psi with safety instructions cast onto the cover. Also available is a 30-inch design hatch cover in steel, aluminum and plastic. Hatch rings for 20-inch vented or non-vented, and 30-inch are available in various heights as part of a complete assembly or as a separate item.