Detailed Product Description Detailed Product Description Features1) Dial: 2.5", 3", 3.5" 2) Thread : 1/8", 1/4", 3/8, 1/2 BSP.PT,NPT (according to custom's request ,)3) Connection: center back connection4) Material: brass tube and connection 5) Accuracy: 1.6, 2.5 6)Scale: Psi, Bar, Kpa, Kg, Mpa. optional