Aloha from Maui,
Ok...this is a three way filter I use on all my gas engines. If filters the fuel going into your engine. It is sold by "BP" hobbies.
http://www.bphobbies.com/view.asp?id...4&pid=E2654892.
They also have other gas goodies for your gas engines too.
I've used these goodies for years, but mainly only two, A129 and A127.
Soft Landings Always,
Bobby of Maui