Ashcroft 91545XLL Pressure Gauge 4.5 in Dial 0-200 Psi Rear Flange

Product Description

The ASHCROFT 91545XLL is an analog pressure gauge built for accurate pressure measurement in demanding industrial, HVAC, plumbing, and mechanical system applications. It features a 4.5-inch dial for easy readout at a distance and covers a pressure range of 0 to 200 psi with a stated accuracy of 0.5% of scale. The aluminum case keeps weight low while the stainless steel wetted parts resist corrosion from process media. It mounts via a rear flange configuration with a 0.5-inch thread connection. Licensed trades and maintenance technicians install this gauge where reliable, long-term pressure indication is required on pipelines, pressure vessels, and mechanical systems.

This gauge is suited for residential and commercial installations where a durable, non-liquid-filled analog gauge is needed. The 4.5-inch dial size and rear flange mount make it a common choice for panel mounting, wall mounting, or direct pipe mounting in boiler rooms, mechanical rooms, compressed air systems, water distribution systems, and HVAC hydronic loops. The dry, non-filled construction reduces the risk of fluid contamination in food-adjacent or clean-room environments.

Key Features

• 4.5-inch analog dial for clear readout from standard working distances
• 0 to 200 psi pressure range suitable for a wide range of mechanical and process applications
• 0.5% of scale accuracy for reliable pressure indication
• Stainless steel wetted parts resist corrosion from water, steam, and mild process fluids
• Aluminum case reduces overall gauge weight without sacrificing durability
• Rear flange mount with 0.5-inch thread for secure panel or pipe installation
• Non-liquid-filled construction — no risk of fill fluid leakage or contamination

Compatibility

Designed as an OEM-style replacement or direct-install analog pressure gauge for residential and commercial piping, HVAC hydronic, compressed air, and general mechanical systems requiring a rear-flange-mount gauge with a 0.5-inch threaded connection and 4.5-inch dial.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician in accordance with applicable local codes and ASME B40.100 gauge installation guidelines. Isolate and depressurize the system fully before removing any existing gauge or installing this unit. Apply appropriate thread sealant or PTFE tape to the male threads before making up the connection — do not overtighten, as aluminum and stainless fittings can gall or crack under excessive torque. Confirm the system operating pressure does not exceed the gauge's rated range during normal or transient conditions.