Stack Adapter w/2.250 Guide Washer

The Stack Adapter w/2.250 Guide Washer (Peterson Fluid MPN 06-0720) is a precision-engineered fluid management component designed for high-performance engine cooling and circulation systems. This adapter serves as a critical junction point in cooling stacks, enabling reliable fluid routing between multiple system components. Built for automotive enthusiasts and professional technicians, this stack adapter ensures optimal coolant flow management in custom and performance-oriented engine builds where temperature control and system integrity are non-negotiable.

The 2.250-inch guide washer integrated into this adapter provides precise alignment and sealing between stacked fluid transfer components, preventing bypass leakage and maintaining consistent pressure throughout the cooling circuit. The washer's dimensional specification ensures compatibility with Peterson's modular stack system, allowing fluid to flow efficiently while the guide feature maintains positional accuracy during assembly and operation. Weighing just 0.15 lbs, this compact adapter minimizes system weight while delivering the mechanical integrity required in demanding engine applications, including street performance, racing, and extreme-duty cooling scenarios.

This stack adapter is ideal for builders configuring Peterson Fluid Systems' cooling or transmission fluid transfer setups, particularly those implementing multi-component sandwich-style configurations. Compatibility depends on matching your existing Peterson stack assembly specifications—verify washer diameter and port threading before installation. Professional installation ensures proper torque sequencing and washer seating, which are essential to eliminate micro-leaks and maintain system reliability under sustained high-temperature or high-pressure conditions typical of modified engines.