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Weil McLain 511-246-345 Gas Valve

Weil McLain

The Weil McLain 511-246-345 Pilot Line Manual Shut-Off Gas Valve is the factory 1/4-inch NPT male x 1/4-inch NPT female manual valve for the pilot gas line on Weil-McLain LGB gas boilers. Weil-McLain’s parts catalog lists 511-246-345 under the CSD-1 common parts for the LGB-5, described as a pilot line manual shut-off gas valve with 1/4-inch NPT male and 1/4-inch NPT female pilot tubing connections. Its male x female body threads inline into the 1/4-inch pilot gas line feeding the pilot burner.

The pilot line is the small gas branch that feeds the pilot burner, the flame that lights the main burner. A manual pilot shut-off valve lets a technician isolate pilot gas without touching the main shut-off valve, and it gives CSD-1 inspection and leak-test procedures a positive stop in the pilot circuit. Weil-McLain’s LGB CSD-1 control supplement has the installer close the pilot shut-off valve during the lighting sequence and reopen it together with the main valve, and it lists a sister pilot shut-off valve, 511-246-340 (a Kinco-Balon P2R), that also serves as a leak test valve. A direct cross-reference for this valve is the Apollo/Conbraco 94MBV02 (94-MBV-02), a forged-brass, full-port, 1/4-inch female x male NPT mini ball valve rated 600 psi at 100°F and listed to ANSI Z21.15/CSA 9.1 and ASME B16.44 for gas service.

Replace the valve when the handle is stiff or seized, the stem packing weeps, or the pilot circuit cannot be shut off positively. Close the main manual shut-off valve and the pilot valve, disconnect the pilot tubing, and unthread the old valve. Keep the male x female orientation the same, use gas-rated thread sealant on the NPT threads, and remake the tubing connection carefully so the flare or compression fitting seats square. Leak-test every joint with approved solution before you relight, and follow the CSD-1 operating instructions for your boiler. Gas work belongs to a qualified technician following local code.

Key Benefits

  • Factory Pilot Line Valve: The OEM pilot shut-off that Weil-McLain lists for the LGB CSD-1 gas train, so the pilot circuit stays as designed.
  • Positive Pilot Isolation: Manual quarter-turn shutoff of pilot gas for lighting, service, and leak testing.
  • Correct Thread Configuration: 1/4-inch NPT male x 1/4-inch NPT female connections match the original pilot tubing arrangement.
  • Cross-Reference Included: The Apollo/Conbraco 94MBV02 (94-MBV-02) mini ball valve is the matching number if you are cross-checking by valve manufacturer.

Common Questions

  • What does a pilot line shut-off valve do? It isolates gas to the pilot burner so you can light, service, or leak-test the pilot circuit without shutting down the main gas supply.
  • Which boilers use it? Weil-McLain’s parts catalog lists 511-246-345 under the CSD-1 common parts for the LGB series. Confirm by boiler model and serial number before ordering.
  • Is it the same as 511-246-340? No. 511-246-340 is a separate Kinco-Balon P2R valve in the same LGB parts list. Match the 1/4-inch male x female configuration to what is on your boiler.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.