SIGHT FLOW INDICATORS THREADED Economy Series S11 S17A S17B S22A S22B Bulls Eye Double Window(up to 285 PSIG) Series S12 S13T S14T High Pressure Bulls Eye Double Window(Class 300/600/900/1500#) Series S16T Full View(Up to 150 PSIG) Series S18T S21T Armored Cylinder(Up to 150 PSIG) Series S19T S22A S22B S22C Self-Cleaning Cylinder(Up to 230 PSIG) Series S17C Ball Action(Up to 435 PSIG) Series S17B S22A FLANGED Bulls Eye Double Window ASME(Class 150/300/600#) Series S13F S14FB S14FC S16F S16FB S16FC Full View Shielded Cylinder(Up to 150 PSIG) Series S18F S21F Armored Cylinder(Up to 150 PSIG) Series S19F Lined/Coated(Up to 1480 PSIG) Series S24F S19F S18FL TRI-CLAMP Sanitary - Stainless Steel(Up to 150 PSIG) Series S23A S23B S24C