Ashcroft 83204 Pressure Gauge 3.5 in Dial 1/4 Npt Center Back

Product Description

The ASHCROFT 83204 is an analog pressure gauge designed for accurate measurement of both positive and negative pressure in plumbing, HVAC, and mechanical systems. It features a 3.5-inch dial with a compound range of -30 to 0 to 15 inches Hg, making it suitable for vacuum and low-pressure applications. The gauge is liquid filled for damping needle vibration and improving readability in high-cycle or pulsating service environments. The stainless steel case provides corrosion resistance in demanding installation sites. Accuracy is rated at 1 percent of scale. A licensed plumber, HVAC technician, or mechanical contractor typically handles installation.

This gauge is well suited for residential and light commercial HVAC and plumbing applications where compound pressure and vacuum measurement is required. The center back mount configuration allows for panel or bulkhead installation where a clean, flush-mounted instrument is needed. The 1/4 inch NPT male thread connection is a standard fitting size compatible with typical gauge ports, manifolds, and test tees used in refrigeration, hydronic, and general mechanical piping systems. No specific compatible system models are listed by the manufacturer for this SKU.

Key Features

• Compound pressure range: -30 to 0 to 15 inches Hg for vacuum and positive pressure measurement
• Liquid-filled case dampens vibration and pulsation, extending gauge service life
• Stainless steel case construction resists corrosion in wet or chemically active environments
• 1 percent of scale accuracy for reliable field measurement
• Center back mount design suits panel, bulkhead, and wall-mounted installations
• Standard 1/4 inch NPT connection fits common gauge ports and test tees

Compatibility

Designed as an OEM-style replacement or direct-install analog compound pressure gauge for residential and commercial HVAC, plumbing, and mechanical piping systems using standard 1/4 inch NPT gauge ports.

Installation Notes

Installation is typically performed by a licensed plumber, HVAC technician, or mechanical contractor. Isolate and depressurize the system fully before removing or installing any gauge. Apply thread sealant or PTFE tape to the NPT threads per the system fluid compatibility requirements, and do not overtighten as stainless gauge bodies can crack at the socket. Verify the selected gauge range is appropriate for the system operating pressure before placing the line back into service.