316 Stainless Steel Boat Floor Drain Scupper (22mm / 25mm) Heavy-duty 316 stainless steel mirror-polished deck drain scupper with screws — compact 22mm & 25mm sizes for boats, yachts and RV drainage systems. Product Description Material: 316 marine-grade stainless steel — precision cast for maximum corrosion resistance in saltwater environments and long service life. Polished, low-profile design — mirror polished finish for attractive appearance and easy cleaning on yacht decks, cockpit floors and wet areas. Two compact sizes: available in 7/8″ (22 mm) and 1″ (25 mm) to suit common drainage hole standards on boats and small craft. Complete mounting kit included — each unit ships with 3 × 4.2 × 25 mm SS316 screws for secure installation into teak, fiberglass or composite decks. Durable, precision casting & fit — engineered to resist distortion, provide reliable drainage, and remain flush with the deck to reduce tripping and snag risks. Suitable for inflatable boats, fiberglass yachts, commercial vessels and RVs. Technical parameters Model Size A B C D E Weight SM0630-22 7/8” (22mm) 46mm 26mm 23mm 3mm 4.5mm 59g SM0630-25 1’’ (25mm) 53mm 29mm 26mm 3mm 5mm 76g Typical applications Boat and yacht deck drainage: cockpit drains, locker and deck scuppers. Marine fittings for fiberglass and inflatable boats, commercial craft and service vessels. RV, trailer or outdoor wet-area drainage where a compact, corrosion-resistant drain is required. FAQ Q: Is this drain suitable for saltwater use?A: Yes — made from 316 stainless steel specifically for superior resistance to seawater corrosion and pitting. Q: Are screws included for mounting?A: Yes — each scupper includes three 4.2 × 25 mm SS316 screws for immediate installation. Q: Which size should I choose, 22 mm or 25 mm?A: Choose 22 mm (7/8″) or 25 mm (1″) based on your existing cutout or desired flow area; confirm A/B/C dimensions in the table before ordering. We also can customized it as your demand. OEM is welcome! Q: Can this be sealed for a fully watertight deck penetration?A: Yes — when a watertight installation is needed, apply an appropriate marine sealant under the flange and ensure proper backing/support during fastening.
