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The Kobold DAK-21 is a sight flow cast iron flap indicator with a flange connection. The DAK-21 operating pressure is 230 PSIG max (optional 360 PSIG or 580 PSIG).
| Component | DAK-21 | DAK-12/22 | DAK-13/23 |
| Flap | 316-Ti Stainless Steel | ||
| 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 300 °F, 230 PSI max) Optional Borosilicate Glass DIN 7080 (up to 530 °F max) | ||
| Screws | Zinc-plated Steel | Stainless Steel | Zinc-plated Steel |
| Seals | Graphite (Others upon Request) | ||
| Mounting Position | Horizontal or Vertical with Flow from Bottom to Top | ||
| Operating Pressure | 230 PSIG max (Optional 360 PSIG or 580 PSIG) | ||
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