These are quad rings for the Lanair nozzles. This is not to be confused with the Delavan Nozzle. These quad rings fit the special nozzle stem that is used on the Lanair waste oil heater nozzles. It fits all Lanair FI, HI, MX, MXD AND MXB models furnaces nozzles / heaters. This type of o-ring, called a quad ring has a ridge around the outside, top and bottom where as a standard o-ring would be smooth and tubular. The only Lanair model that it does not fit is the CA models which have a standard nozzle o-ring as found on the Delavan nozzles.
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