I have a 2006 Merc 4 stroke EFI. I want to install a quick oil drain system, they go by plug size not by engine. My plug is part # 8288181 according to mercury but they could not tell me the plug size. I thought I saw somewhere it is 14x1.5mm but I'm not sure. If anyone knows the size please let me know, searched the net but no luck. Thanks in advance.