This rolling diaphragm indicator detects differential pressures as low as 5 psid +/- 0.5 psid up to 15 psid +/- 1.5 psid while maintaining a size compact enough to be mounted in a SAE-AS33514-8 port. High pressure sensing port is located radially on the OD just below the .750-16 UNJF mounting threads with the low pressure sensing port opposite and along the axis of the signal button. Signal: Visual. Reset: Manual.