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The Vent Protector, commonly known as a “mud dauber” fitting, is an essential safety and maintenance component designed to protect open-ended instrumentation lines—such as relief valve vents, bleed lines, or breather tubes—from environmental blockages. It features a fine-mesh stainless steel wire screen that allows for the unrestricted flow of gases or fluids while preventing insects, debris, and contaminants from entering and clogging the system. The fitting is typically designed with a male NPT or ISO threaded end for easy installation into the exhaust port of a valve or manifold. Manufactured from corrosion-resistant materials like 316 stainless steel or brass, vent protectors ensure that critical pressure-relieving devices remain functional and unobstructed, maintaining the overall safety and reliability of industrial fluid systems and process instrumentation.
| VENT PROTECTOR | |||||
|---|---|---|---|---|---|
| NPT Thread | Dimensions in (mm) | ||||
| T-Tube O.D. (in.) | Basic Ordering Number | L | F | B | E |
| 1/8 | VVP-SS-2 | 0.56(14.2) | 0.50(12.7) | 0.38(9.7) | 0.19(4.8) |
| 1/4 | VVP-SS-4 | 0.78(19.8) | 0.56(14.3) | 0.56(14.2) | 0.28(7.1) |
| 3/8 | VVP-SS-6 | 0.81(20.6) | 0.69(17.5) | 0.56(14.2) | 0.41(10.4) |
| 1/2 | VVP-SS-8 | 1.03(26.2) | 0.87(22.2) | 0.75(19.1) | 0.50(12.7) |
| 3/4 | VVP-SS-12 | 1.06(26.9) | 1.06(27.0) | 0.76(19.2) | 0.72(18.3) |
| 1 | VVP-SS-16 | 1.37(34.8) | 1.37(34.9) | 0.94(23.9) | 0.88(22.4) |