[Matt S.]

Paul,

Thanks for asking this question. I too wondered why only the slide valve was available and not the pressure relief valve.

I am getting ready to take my external thermostat apart to replace the slide valve as my lines going to the thermostat get hot but my lines going from the thermostat to the trombone cooler remain cold. Tony, thanks for the picture and for other posts I have followed you on.

Good luck Paul,

Matt