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The Kobold DAR-21 is a sight flow cast iron rotor indicator with a flange connection. The DAR-21 operating pressure is 230 PSIG max (optional 360 PSIG or 580 PSIG).
| Component | DAR-21 | DAR-12/22 | DAR-13/23 |
| Rotor | Plastic (up to 250 °F) or Option "R" PTFE up to 500 °F (Nominal Size 2"and above: PTFE Standard) | ||
| Housing | Grey cast iron 0.6025 | 316 Stainless Steel (1.4408) | Cast Steel 1.0619 |
| Cover Plates | Grey Cast Iron 0.6025/ S235JRG2 | 316 Stainless Steel (1.4408)/ 316 Stainless Steel (1.4301) | 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 | Stainless Steel | Zinc-plated Steel |
| Seals | Graphite (Others on Request) | ||
| Mounting Position | Universal | ||
| Operating Pressure | 230 PSIG max (Optional 360 PSIG or 580 PSIG) | ||
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