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

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