Vent limiters are designed for indoor use

As a veteran HVAC service tech

this violet-coded component ensures your RV81/210D/325-7A series equipment operates within the specified 4-12" W

it is fully compatible with standard D-9999-104 ball joints and other JC linkage hardware

Whether you are performing routine maintenance or a full system overhaul

Maxitrol R8110-412 Spring Vent limiters are designed forEnsure reliable gas pressure regulation with the Maxitrol R8110 412, a precision engineered violet range spring designed for field proven performance. This replacement regulator spring is specifically calibrated to provide a consistent outlet pressure range of 4 to 12 inches Water Column (W. C.), making it a critical component for fine tuning gas flow in commercial and industrial environments. Built to integrate seamlessly with the Maxitrol RV81, 210D