This replacement 2 inch diameter lid has a simple pressure release vent cap and fits both the 2 and 5 gallon basic barrels.
If you use, or wish to fit, a gas injection system, the 2" lid is also available bored for use with an existing valve or pre-fitted with either a Pin valve or S30 valve.
These lids are labelled "Lubricate the seal before use". In practice, if you put vaseline on the white 2" O-ring, you will find that you have difficulty in obtaining a good seal, The Vaseline should, instead, be rubbed onto the threads, rather than the O-ring.
These lids are designed to work on standard barrels supplied to us by Youngs and Ritchies from 2009 onwards. It may not fit on barrels manufactured before this date, or supplied by other distributors, as the screwthread that attaches the lid to the barrel may be different.