This softer spring is standard in all fully recirculated Mach 2 valves and can also be fitted to Respons TMS and Deceptor Pro II valves. It should only be used when the valve is fully recirculated or if the engine idle vacuum is less than 19Hg. For atmosphere venting with an engine idle vacuum over 19Hg, the standard spring (6115) should be used instead.
![Soft Replacement Spring [6116]](http://www.gfbeurope.com/cdn/shop/files/218045_46894f2d-1468-47ec-9452-b62e1f68ebff.jpg?v=1741359981&width=1445)
