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Brass temperature pressure gauge with half inch bottom mount and three inch probe

Legend Valve

Legend Valve 800-684 1/2 B-Mount 60-280 T&P 3-Pro accessory

SKU CH-1RBT-AXRGJ

Bottom-mount temperature and pressure gauge with 1/2" MPNT connection and 3" probe extension

  • Bottom-mount probe fits tight boiler spaces
  • 1/2" MPNT connection matches standard fittings
  • 3" probe length reaches into the flow
  • 60-280 temperature and pressure range covers common systems
  • New condition ensures clean, unused internals

Bottom-Mount T&P Gauge

The Legend Valve 800-684 is a bottom-mount temperature and pressure gauge with a 1/2 inch MPNT connection and a 3-inch probe. It reads from 60 to 280 and is built for hydronic heating systems that need combined temperature and pressure monitoring at the boiler or radiator.

Compatibility Check

Verify that your system has a 1/2 inch MPNT port oriented for bottom mounting and that the 3-inch probe length suits the vessel or pipe where it will be installed. The operating range of 60 to 280 must cover the expected temperature and pressure of your application, and local codes may require this specific gauge type.

Replacement Scope

This gauge replaces an existing bottom-mount T&P gauge with the same connection size, probe length and 60-280 range. The upgrade is worthwhile when the old gauge is out of calibration, leaking or missing, or when a code inspection requires a new unit with the Proposition 65 notice.

How it compares

Measured against everything we stock in Radiator Fans & Boiler Parts, at today’s prices. Recalculated every night.

Price $19.99
Cheaper than about 65% of the 95 comparable items (median $25.99).

Specifications

Product
Brand nameLEGEND VALVE

Questions about this item

What comes in the box with the Legend Valve 800-684 T&P gauge?

The package includes the bottom-mount temperature and pressure gauge with a three-inch probe and 1/2 inch male pipe thread connection.

Which pressure range suits my system — 60 or 280?

The gauge reads from 60 to 280, so choose it when your operating pressure falls anywhere inside that span.

What does the 60-280 figure mean once the gauge is installed?

It shows the live pressure reading in real time, letting you confirm the system stays between the minimum and maximum limits.

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