It's a 4 ouncer. I've changed o rings & cut notches in the ends of the injector tubes to help with removing the tips, but now with the new o rings it's easy to do anyway. Has blending block that comes with it. If i didn't have a basstackle dual 6 ounce twinjector i'd keep it. Be good for somebody wanting a cheap dual injector. $130.00 outfit i'd take 75 shipped to your door. I can send pics in a text. Thanks
