A check valve is used to prevent muffler back pressure from causing the system to loose the fluid prime. Most of them on the market don’t perform this task very well. This check valve has a 3/4” diaphragm that is made from Viton. The large disc area allows for double the sealing area and assures zero pressure leaks past. It only requires .5 psi to "crack” open. What all this accomplishes is virtually instant on and off smoke trail as you would expect.
FORA1017 Smoke Check Valve w/Viton Diaphragm of 1/8” ID Tubing SMAP $6.49