SNOUTs are NOT named for the pipe sizes they should be used on. The SNOUT models are named based on the width of the SNOUT where the access port is typically found, followed by an F or an R. F series SNOUTs are for FLAT walled structures (boxes or vaults) and R series SNOUTs are for ROUND walled structures (manholes). A “TB” after the name means it is a 2-part SNOUT (Top and Bottom). If there is a number after an R, it refers the diameter of structure it is designed to fit. For instance, a 52RTB72 means a SNOUT that is 52” wide for a ROUND structure, with a Top and Bottom that fits a 72” ID manhole. Please note the correct SNOUT size will always be bigger than the nominal pipe size.
