This item is a stainless steel oil/fuel pipe ferrule to fit black rubber style 5/16" internal diameter BSP pipe - of the type often used on Norton models for cambox pipes, breather pipes or similar - but this type will fit over pipe with an OD of 14mm.
These are UK manufactured by a specialist ferrule maker.
Although 5/16" internal pipe bore is a standard BSP pipe size, it should be noted that many commercial fuel and oil breather pipes have different outer diameters - and therefore some ferrules will fit and others will not. This particular ferrule is a good quality UK manufatured ferrule with an internal bore of 0.544"/13.8mm - meaning it will fit over fuel/oil pipes with an outer diameter of 14mm. Notw we also manufacture ourselves a slightly bigger 5/16" ferrule, which will fit over pipes with an outer diameter up to 15mm - see Item 0979b (but they are CNC turned from solid stainless bar and far more expensive).
Price is Each.
These ferrules can be crimped with a commercially available ferrule crimping tool - but often on breather pipes, all that is necessary (if the ferrule is a firm fit over the pipe, and is mainly to be cosmetic only) is to use a centre punch half way along the length of the ferrule to stop it slipping off. If you are using it for fuel - as with all fuel pipes - it will require some form of crimping tool to ensu