Suburban Mfg Nautilus Water Heater Vent Cap 2in. For 1in. 2in. Wall Thickness. 2 inch for 1 to 2 inch wall thickness. Designed for use with the Suburban Nautilus series water heaters. Quick and simple application. Refer to manufacturer guidelines for proper application/installation. Features of Suburban Mfg 261617 Nautilus Water Heater Vent Cap 2in. For 1in. 2in. Wall Thickness A replacement panel and vent cap are required when replacing Suburban 6 10 12 and 16 gallon tank units with the Nautilus on-demand RV water heater Vent Size: 2 in. Use with 1 in.-2 in. wall thickness Follow manufacturer recommendations for proper fit/installation information Package Contents: Suburban Mfg 261617 Nautilus Water Heater Vent Cap 2in. For 1in. 2in. Wall Thickness Suburban Mfg 261617: Nautilus Water Heater Vent Cap 2in. For 1in. 2in. Wall Thickness