Petersen 311-400- 311 Series Temperature Pressure Pete's Plug 1/4" MNPT x 1.5 L, Neoprene

Overview

Petersen 311-400 Temperature/Pressure Pete's Plug (1/4" MNPT x 1.5 L, Neoprene) is a compact, high-reliability access port designed for fast, accurate pressure and temperature readings without leaving gauges installed on the line. Built from 316 stainless steel with a self-sealing neoprene valve, it delivers long-term durability in demanding industrial environments where waxes, oils, refrigerants, petroleum products, and similar media are present.

Key Features

• Enables quick temperature and pressure checks without permanent gauges
• Self-closing valve seals instantly after probe removal
• Protective cap adds an extra seal and shields the valve from contamination
• Standard 1/4" MNPT connection for easy integration into piping systems
• 316 stainless-steel body and cap for excellent corrosion resistance
• Compatible with many waxes, fats, oils, greases, petroleum products, and refrigerants

Technical Specifications

• Model: 311-400 Temperature/Pressure Pete's Plug
• Thread Size: 1/4" MNPT
• Body Length: 1.5" (38.1 mm)
• Probe Diameter: 1/8" (3.175 mm)
• Body Material: 316 stainless steel
• Cap Material: 316 stainless steel
• Valve Material: Neoprene
• Strap Color: Blue, two grooves
• Maximum Pipeline Pressure: Up to 1000 psi (68.96 bar)
• Temperature / Pressure Rating: 500 psi (34.49 bar) @ 200°F; 1000 psi (68.96 bar) from -20°F to 140°F
• Chemical Resistance: Many waxes, fats, oils, greases, petroleum products, refrigerants, and similar media
• Shipping Weight: 0.5 lb (0.23 kg)
• Country of Origin: USA

Applications

• HVAC temperature and pressure diagnostics
• Refrigeration and cooling systems
• Industrial process lines and test points
• Oil and gas, petrochemical, and utility systems
• Routine maintenance and troubleshooting on pressurized piping

Compatibility

This Pete's Plug is designed for systems using 1/4" MNPT ports and works with standard temperature and pressure probes sized for a 1/8" (3.175 mm) access opening.

Why Choose This Pete's Plug?

The 311-400 Pete's Plug reduces the need for permanently installed gauges, lowering leak points and component costs while still giving you fast access to live pressure and temperature data. Its 316 stainless-steel construction, neoprene sealing element, and high working pressure ratings make it a reliable choice for demanding industrial and HVAC environments.

Included

• Petersen 311-400 1/4" MNPT x 1.5" Temperature/Pressure Pete's Plug
• 316 stainless-steel protective cap
• Integrated neoprene valve

Call to Action

Improve your diagnostic access and reduce the need for permanent gauges — add the Petersen 311-400 Stainless-Steel Pete's Plug to your system today.