Sight Flow Indicators. Diameter: 2". Housing: Cast Steel 1.0619. Connection, 2" NPT. Rotor: Plastic.

Sight Flow Indicators<br />
Brand: Kobold (USA)<br />
Model: DAR-1308H-N50-Q<br />
[DAR-1]:<br />
Rotor: Plastic (up to 250 °F) or Option "R" PTFE up to 500 °F (Nominal Size 2" and above: PTFE Standard)<br />
Housing: Cast Steel 1.0619<br />
Cover Plates: Cast Steel 1.0619/S235JRG2<br />
Sight Glass: Soda-Lime Glass DIN 8902 (up to 250 °F, 230 PSI max)<br />
Optional Borosilicate Glass & PTFE Rotor DIN 7080 (up to 500 °F max)<br />
Screws:  Zinc-plated Steel<br />
Sealing: Graphite<br />
Mounting Position: Universal<br />
Operating Pressure: 580 PSIG<br />
[3]: Housing: Cast steel<br />
[08H]: Nom. diameter, 2"<br />
[N50]: Thread: 2" NPT-thread female<br />
[Q]: Option: Borosilicate Glass, 580 PSIG max<br />
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Datasheet: http://www.kobold.com/uploads/files/s6gb_dar-1-2.pdf