Review on 🔧 1108 Late Model GM Master Cylinder Adapter - Motive Products by Hugo Caywood

Although the official application on Motive is "GM Round 3 Tab" reservoirs, it worked fine on my 2003 Mazda6 i Sedan. (Thanks to various Mazda forum posts I was able to reference!) The adapter comes with two gaskets - one thin and one thick. I used a thick one and the adapter was still easy to screw on. I pressurized 10psi into the outlet ball with no evidence of a leak in the master cylinder reservoir.