An MFl tailpiece washer is a small plastic washer that fits in-between a male and female flared fitting - AKA MFL Fitting.
An MFl tailpiece washer is a small plastic washer that fits in-between a male and female flared fitting - AKA MFL Fitting.
These should always be used to help prevent any small leaks that may be happening in the mfl joint usually cause by very minor imperfections in the metal.