If you have an AEB-type LPG system, it will have 1 of 2 connector styles for your PC interface. The older style is a square block with 2 rows of 4 pins (only 6 pins are used). The newer style is an AMP superseal 4-pin connector. Your PC connection lead may have just 1 of these styles of plug. This adaptor lead will allow you to use your lead with either style of connection (old to new or new to old).