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Plastic is strongly recommended for any plumbing access prone to moisture zero rust, and good ones are fully water-repellent. Reinforced plastic handles occasional dampness without warping. A dependable option for exterior-related plumbing is this durable plastic panel https://www.amazon.com/Access-Panel-Drywall-Plumbing-Durable/dp/B085617TBL?tag=contractorhub-20 made to resist water exposure, UV-stabilized for longevity, textured for painting, and the hinged/removable door gives plenty of room to work. Easy adhesive install, stays secure, and provides peace of mind knowing corrosion won’t be an issue even if a leak happens.