Reservoir Breather Valve - 5 PSI

***This 5 PSI Breather Valve is a newer design which replaces discontinued 10 PSI Breather Valve, former p/n 10486*** High flow steering pumps are prone to cavitation which results in both excessive pump whine/noise as well as reduced pump life. Adding positive pressure to a reservoir greatly reduces cavitation in high flow pumps, especially at higher engine speeds. The Radial Dynamics 5 PSI Reservoir Breather Valve allows thermal expansion of steering fluid to compress air in the top of a steering reservoir up to 5 PSI maximum positive pressure, relieving excess pressure to help protect the steering pump shaft seal*. This valve additionally features a free-flowing reverse check valve that allows ambient air to re-enter the reservoir when steering fluid cools and returns to its original fill height, preventing a potential vacuum condition in the reservoir upon next vehicle startup.   Unlike other remote reservoir pressure valves which can generate an oil mist in the engine bay if oil o