This is a A-GG60 Gauge, 60 Lb., Glycerin Filled PN: GG60Main Description As Following : A-GG60 Gauge, 60 Lb., Glycerin Filled PN: GG60 Found in Section & Models : Miscellaneous > Miscellaneous, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Glycerin filled to lubricate, help prevent point flutter and prevent corrosion of the movement. Dim A (1): Nickel silver movement, accurate to within 2% of full range reading. Dim B (2): PSI / Bar Dial Dim C (3): 1/4" -18 NPT male fitting at bottom of gauge. Diameter: 2 1/2" Lens: Plexiglass Crystal