This 40mm adaptor allows non Sky LNB’s to be used with the MK4 zone 1 and zone 2 satellite dishes.This adaptor will allow any standard 40mm necked LNB to be fitted to your existing dish.The original collar / adaptor supplied with the Sky LNB is to small as it has an internal diameter of around 37mm.This adaptor / collar solves this problem and will allow you to use the LNB of your choice such as an Inverto type which will out perform the standard LNB supplied when the dish is used outside of the normal UK satellite footprint.The adaptor is supplied disassembled but is very easy to put together.This is what you get:Main adaptor / collar assemblyUpper half ring of collar assemblyLocking PinRetaining Metric Bolt & NutQuantity Supplied: 1 Adaptor SuppliedThe adaptor assembly simply clips on to the MK4 LNB support arm of your dish.