The Suburban Access Door is a water heater access door designed for Suburban 10-gallon water heaters.• Compatible with the Suburban 5286A Nautilus Tankless On-Demand RV Water Heater• Fits 10, 12, and 16-gallon Suburban water heaters• Replaces 6277APW• Door Dimensions: 18.675"W x 18.675"H• Outside Frame Dimensions: 18.169"W x 18.169"H• Inside Frame Dimensions: 16.25"W x 16.25"H Replaces 6277APW Door measures 18-5/8"" x 18-5/8"" | Suburban 6377APW 10-Gallon Water Heater Access Door, Polar White