WIKA 9851739 Npt Water Pressure Gauge 2-1/2IN 1/4IN 0-55IN-H2O

( Brand: Wika ), ( Manufacturer Part Number: 9851739 ), ( Part Type: Pressure Gauge ), ( Connection Diameter: 1/4 In ), ( Fitting Size: 0.25 In ), ( Product Condition: New Other ), ( Dial Size: 2.5 In ), ( Reference Sku: 1052059 ), ( Thread Type: Npt )

Review WIKA Pressure Gauge 2-1/2in 1/4in Npt

The **WIKA 9851739 Pressure Gauge** is a precision-engineered, high-performance instrument designed for reliable and accurate measurement of low-pressure systems, making it an indispensable component in applications where fluid dynamics, air handling, or vacuum processes are critical. This gauge features a robust **2-1/2 inch (63.5 mm) dial face**, providing ample visibility for easy reading even from a distance, while its **1/4-inch NPT (National Pipe Thread) male connection** ensures secure and leak-proof integration into piping systems. The **0-55 inches of water (in-H O) range** makes it ideal for monitoring low-pressure environments such as HVAC systems, ventilation ducts, laboratory filtration, or industrial air filtration applications where precise control of airflow or pressure differentials is essential.

Constructed with **durable stainless steel housing**, the gauge is built to withstand harsh operating conditions, including exposure to moisture, temperature fluctuations, and mechanical stress, ensuring long-term reliability in demanding environments. The **high-contrast, easy-to-read dial** features a **black background with white markings and a red pointer**, enhancing visibility and reducing operator fatigue during extended monitoring sessions. The gauge is also equipped with a **sealed, corrosion-resistant bourdon tube mechanism**, which guarantees consistent accuracy and resistance to environmental contaminants, including dust, oil, and chemicals. For added protection, the gauge includes a **safety glass cover**, safeguarding the internal components from physical damage while maintaining the integrity of the pressure measurement.

The **1/4-inch NPT connection** allows for straightforward installation into systems requiring precise low-pressure monitoring, while the **flanged or threaded mounting options** (depending on application needs) provide flexibility in integration with various piping configurations. WIKA s reputation for **calibration excellence** ensures that this gauge delivers precise readings with minimal drift over time, making it a trusted choice for industries where accuracy and dependability are non-negotiable. Whether used in **commercial HVAC systems, industrial air filtration, or laboratory settings**, the WIKA 9851739 Pressure Gauge offers a perfect balance of durability, clarity, and performance, making it a standout solution for low-pressure measurement challenges.

### **Pros and Cons of buying a WIKA 9851739 Pressure Gauge (2-1/2" Dial, 1/4" NPT, 0-55" H O)**

1. **High Accuracy and Reliability** WIKA is a well-established brand known for precision-engineered instruments. This gauge is designed for accurate pressure measurement in low-pressure applications, making it suitable for HVAC, ventilation, and pneumatic systems where consistency is critical.

2. **Durable Construction** The 2-1/2" dial size provides better visibility and readability compared to smaller gauges, reducing eye strain during operation. The robust housing and internal components are built to withstand frequent use in industrial or commercial environments.

3. **Compatibility with Common Systems** The 1/4" NPT connection is standard in many HVAC, air handling, and low-pressure pneumatic applications, making installation straightforward without the need for adapters in most cases.

4. **Wide Range Suitability** The 0-55" H O range is ideal for measuring low-pressure differentials in systems like ductwork, air filters, or small compressors where pressures remain below 55 inches of water column.

5. **Easy Installation and Maintenance** The gauge features a standard NPT thread, allowing for quick mounting on pipes or fittings. WIKA gauges are generally designed for easy calibration and replacement of internal parts if needed.

6. **Corrosion Resistance** The gauge is likely constructed with materials resistant to moisture and mild corrosive environments, which is important for HVAC systems where condensation or airborne contaminants may be present.

7. **Backed by Technical Support** WIKA offers extensive documentation, calibration services, and customer support, which can be valuable for troubleshooting or ensuring long-term performance.

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1. **Limited Pressure Range** The 0-55" H O range is very narrow and may not be suitable for applications requiring higher pressures (e.g., above 50 psi or 100" H O). If your system operates outside this range, this gauge will not be functional.

2. **Potential for Condensation Issues** In environments with high humidity or temperature fluctuations (e.g., outdoor HVAC systems), condensation inside the gauge could affect accuracy or cause internal damage over time. Some users may need to add a drain or use a sealed housing for protection.

3. **Cost Compared to Generic Brands** WIKA gauges are premium products and may be more expensive than generic or no-name alternatives. While the quality justifies the price for many applications, budget-conscious buyers might opt for cheaper options if they don t require the same level of precision.

4. **Dial Size Trade-Off** While the 2-1/2" dial improves readability, it also makes the gauge slightly bulkier. In space-constrained installations (e.g., tight ductwork or compact panels), this could be a drawback.

5. **Calibration Requirements** Like all precision instruments, this gauge may require periodic calibration to maintain accuracy. If calibration is not performed regularly, readings could drift over time, leading to potential system inefficiencies or safety concerns.

6. **Limited Customization** The gauge comes with standard features (e.g., 0-55" H O range, 1/4" NPT). If you need specialized features like remote sensing, different units (e.g., kPa), or additional protections (e.g., explosion-proof), you may need to purchase an alternative model.

7. **Potential for Overkill in Simple Applications** For very basic or low-cost systems where minor inaccuracies are acceptable, a simpler, cheaper gauge might suffice. WIKA s precision may be unnecessary for non-critical applications.

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The **WIKA 9851739 pressure gauge** is an excellent choice for applications requiring **high accuracy, durability, and reliability in low-pressure environments** such as HVAC systems, ventilation, or pneumatic controls. Its **2-1/2" dial size enhances readability**, and the **1/4" NPT connection ensures compatibility with standard setups**. However, it is **not suitable for high-pressure applications** and may require **additional protection in humid or corrosive conditions**. The **premium cost** is justified by its **long-term performance and support**, but buyers should weigh this against the need for **periodic calibration** and potential **bulkiness** in tight installations.

- You need **precise low-pressure measurements** (0-55" H O) in **HVAC, air handling, or pneumatic systems**.

- You prioritize **brand reliability, durability, and ease of maintenance**.

- Your system **cannot tolerate inaccuracies** and requires a **trusted instrument**.

- You are willing to **invest in a long-term solution** with minimal downtime.

- Your application requires **higher pressure ranges** (e.g., above 55" H O or 5 psi).

- You are working in **extremely harsh environments** (e.g., high humidity, corrosive gases) and need additional protection (e.g., a sealed or drain-equipped gauge).

- Budget constraints make a **cheaper, generic gauge** an acceptable compromise for your needs.

- You need **custom features** (e.g., remote sensing, different units, or explosion-proof certification).

For most **professional HVAC or industrial low-pressure applications**, the WIKA 9851739 is a **strong, well-supported choice**. However, always verify your system s specific requirements before purchasing to ensure compatibility.

Details:

New with box.

part #: 9851739 prices

• $27.99-$73.49

specifications pressureswitchiz:

• brand: Wika
• mpn: 9851739
• part type: Pressure Gauge
• connection diameter: 1/4 In
• fitting size: 0.25 In
• product condition: New Other
• dial size: 2.5 In
• reference sku: 1052059
• thread type: Npt

offer pressureswitchiz:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• best offers: True
• started: April 9, 2026
• quantity: 1

seller pressureswitchiz:

• rating: 99.8%
• city: Lebanon, Oregon
• # reviews: 3210

payments pressureswitchiz:

• credit card: Diners-club
• wallet: Google-pay
• other

returns pressureswitchiz:

• paid by: Seller
• method: Money back
• time: 30 Days
• policy: Returns Accepted

shipping pressureswitchiz:

• transit: 4-9 Days
• class: Standard
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS
• cost: $0.00

general pressureswitchiz:

• condition: New Open box
• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Air Pressure Gauges

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