Radiator caps are a common replacement item. For older rotaries, they use the large diameter and for all 1986 and newer cars, the small diameter is the standard. For the small diameter, we carry both a 13psi and a 19psi. The original pressure of 13psi is perfect for 99% of cars. The 19psi is intended for race cars needing the higher boiling temperature of high psi cooling systems. Of course, it stresses the hoses more, so use a 19psi cap only if you must.
* Quality stainless construction
* Original fit
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