Applications Used for hydraulic and pneumaitc systems Compressors, compressed air system Suitable for fluid medium which does not clog conenction port or brass Uesd for providing protection from vibration and pulsation. Case:stainless steel Ring:stainless steel Window:pc Socket & connection:brass Movement:brass Pointer and dial:aluminum Liquid:glycerin, silicone Range:vacuum, compound 0 to 6000 psi Class:1.6% Mounting type:back