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When an old access hatch cracks or fades, this 4-inch hatch is a quick way to close the opening back up. It's molded from UV-resistant ABS, so it resists the fading and brittleness that sun exposure causes over time on lighter exterior fittings.
A waterproof seal keeps moisture from working its way into the compartment behind it, and the hole pattern is designed to line up with most original hatch rings, so replacing one is usually a straightforward swap rather than a full re-drill.
A handy part to keep around for aging or cracked access hatches around the RV's utility openings.