Coolant Pressure Cap Rating?

My Merlyn 11A came with a 13 psi coolant pressure cap installed.

Curious as to what pressure cap rating other use?

Thanks!

Angus

I use a 13 lb cap on almost everything. 7 lb on some really old stuff. Higher pressures work if you need to run higher temps that what we see, and our engines and cooling systems mostly don't respond to that very well.

Brian