Aqualine PG400L Liquid Filled Pressure Gauge 0-400 Psi

Product Description

The AQUALINE PG400L is a liquid filled pressure gauge designed for accurate pressure monitoring in plumbing, HVAC, pool, and general fluid system applications. The liquid fill dampens needle vibration and protects the internal mechanism from pressure spikes and pulsation, giving a stable, readable display under dynamic operating conditions. The gauge reads from 0 to 400 psi and connects via a 1/4 inch MIPT inlet, making it compatible with standard threaded ports found on pumps, filters, and pressure systems. Licensed tradespeople and experienced service technicians are the typical installers for this type of instrument.

The PG400L suits residential and light commercial installations where pressure readings up to 400 psi are required. Common applications include pool and spa pump systems, booster pump assemblies, irrigation manifolds, and HVAC hydronic circuits. The 1/4 inch MIPT inlet threads directly into standard gauge ports without adapters in most configurations. It is a practical, field-ready instrument for routine service checks and permanent panel mounting alike.

Key Features

• 0 to 400 psi range covers high-pressure pump and filter monitoring needs
• Liquid fill stabilizes the needle against vibration and pressure pulsation
• 1/4 inch MIPT inlet fits standard gauge ports on pumps, filters, and manifolds
• Compact design suited for both permanent installation and portable service use

Compatibility

Designed as an OEM-style replacement or new-install gauge for plumbing, pool, HVAC hydronic, and general fluid system applications requiring a 1/4 inch MIPT threaded connection and a 0 to 400 psi measurement range.

Installation Notes

Installation is typically performed by a licensed plumber, HVAC technician, or pool service professional. Shut off system pressure and relieve any residual pressure in the line before removing an existing gauge or threading in a new one. Apply thread sealant tape to the MIPT threads in accordance with local plumbing code requirements before installation. Do not over-tighten the inlet fitting, as this can crack the gauge body or distort the port threads.

Technical Specifications

• Pressure Range: 0 to 400 psi
• Inlet Connection: 1/4 inch MIPT
• Fill Type: Liquid filled
• Weight: 0.44 pounds

Standard Information

• Brand: AQUALINE
• Manufacturer Part Number: PG400L