Extech 480400 Phase Sequence Tester, 15 Hz to 400 Hz, 40 V to 600 V, CAT III 600V, For Three Phase, Digital 48 73 0023 Pressure Rating Low Pressure Shape Pressure Rating Low Pressure Shape Straight Fitting Type Flange Fitting Connection Slip On Weld Female Pipe Size (A) 8 Pipe Size (B) 8 Flanged Connection Surface (B) Raised Flange OD 13 1 2" For Bolt Diameter 3 4" Bolt Hole Diameter 7 8" Number Of Bolt Holes 8 Bolt Circle Diameter 11 3 4" Pressure Class 150 Material Steel Maximum Pressure @ Temperature 285 psi @ 72° F Maximum Steam Pressure @ Temperature 150 psi @ 300° F Certificate Form Digital Certificate Type Material Certificate with Traceable Lot Number Connects To Pipe Flange Construction One Piece For Fitting Material Iron NEMA Configuration: L14 30R (3 pole 40 to 60 v 7w phase sequence tester has a 40 to 600 v rated range for testing phase orientation of 3 phase power sources over a 15 to 400 hz frequency range