The Suburban Vent Cap is a replacement RV water heater vent cap for Suburban water heaters.• For 2" - 3" wall thickness• Compatible with Suburban 5286A Nautilus Tankless On-Demand RV Water Heater• Mounting brackets not required• 4 screws secure the vent cap to your water heater• 3" diameter 4 screws secure the vent cap to your water heater 3"" diameter | Suburban 261618 Wall Vent for 2"-3" Wall Thickness