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This water level gauge is suitable for steam boilers or reservoirs with a working temperature of t ≤ 220 ℃, and is used to indicate the liquid level through two colors displayed on the glass plate: red (with water) and green (without water).

| code | size(mm) | Part name | material | |||||
| L | L1 | D | D1 | D2 | Z-φd | |||
| FLD-109-300 | 300 | 145 | 115(105) | 85(75) | 65(55) | 4-φ14 | valve body | Q235,forged steel |
| FLD-109-350 | 350 | 172 | Sealing | bushing | ||||
| FLD-109-440 | 440 | 200 | Glass gasket | graphite | ||||
| FLD-109-A | A | B | glass | Low alkali high borosilicate | ||||
| Nominal pressure | 2.5(4.0)Mpa | |||||||
| strength test pressure | 4.0(6.4)Mpa | |||||||
| Seal test pressure | 2.5(4.0)Mpa | |||||||
| operation temperature | ≤225℃ | |||||||
| Working medium | Water, steam, oil | |||||||