HM - Suit large burner on 2 burner deluxe or 3 burner stove
E - Suits Small or medium lantern
FM - Suits Large Lanterns
G - Suits small burner on most stoves
BJ - Hose restrictor Jet
GN - Suits Large Burner on Classic 2 burner stove
Please note that different brand gas appliances have varying threads. Most jets have an imprint of a letter or number. Please be careful not to damage the jet as you remove it, as you may make that imprint illegible. If you are unsure of your jet, please contact us with a picture of your jet, and we will get back to you.