The Chem Flowtronics Models, 102, 103, and 104 standard in-line flanged sight flows are available in 316 stainless steel (wetted parts) or carbon steel. Pipe line sizes are available up to 20 inches. Our Model 102 (right flow pattern) sight flow offers you flexibility of design where in-line or size requirements are not standard. The Model 103 or “T” sight flow indicator gives you positive view of flow to three connecting lines.