... is a problem. Type :PF-04 (Welded Case Fillable Gauge)Application:For rugged applications and harsh environment conditions, especially where ... is a problem.Dial size: 2", 2.5", 4", 6"Pressure range:-30" Hg-0-15,000PSISocket:316SS bottom and back ... 3) Center back connection with front flange,4) Center back connection with U-clamp5) Lower back connection with U-clamp Welded Case oil pressure gauge