The 265-16-1 Gasket Base is a replacement gasket that was part of obsolete gasket kit KK-4312-2 for several DeVillbiss/Black and Decker air compressors.
The 265-16-1 Gasket Base fits the following air compressor model numbers and others:
DeVilbiss
IR5G20AD Type 0 Construction Compressor
ACBL660V Type 0 Workshop/Auto Compressor