Weil McLain 511-246-340 Valve

Q: What is the Weil McLain 511-246-340?

It is a manual pilot shut-off valve, the Kinco-Balon P2R shown on the LGB-6 to LGB-20 Series 2 control supplement parts list as both the pilot shut-off valve and the leak test valve, with a 1/8-inch male and 1/4-inch compression connection.

Q: Is it the same as the 511-246-345?

No. The 511-246-345 is a separate pilot line manual shut-off valve with a 1/4-inch NPT male by female connection. Order the 511-246-340 only when the old valve is a Kinco-Balon P2R or is specified under that number.

Q: How do I know the old valve needs replacing?

A stiff or seized handle, gas odor at the valve, or a bubble test that shows leakage at the seat or connections means the valve should be replaced. Always leak-test after the repair.

Weil McLain

$120.00

The Weil McLain 511-246-340 Pilot Shut-Off Valve is the OEM manual gas valve that isolates the pilot gas line on Weil-McLain gas-fired boilers. In Weil-McLain's own LGB-6 to LGB-20 Series 2 control supplement parts list it appears as the Pilot shut-off valve, described as a Kinco-Balon P2R, and the same 511-246-340 is listed again in that parts list as the Leak test valve. The factory photo shows a compact cast aluminum-colored body marked ON, a paddle-style thumb handle, a zinc-plated 1/8-inch male pipe thread on top and a 1/4-inch brass compression nut on the outlet end. It is a manual gas valve, 1/8-inch male by 1/4-inch compression.

A pilot shut-off valve does one job: it lets you close the gas to the pilot without touching the main gas line or the main manual shut-off valve. That matters on standing-pilot and intermittent-pilot systems when you need to service the pilot assembly, replace the thermocouple or flame sensor, leak-test the pilot tubing or shut the pilot off for the season. The handle turns a seat inside the cast body, and over time the seat can weep gas, the handle can stiffen or seize, or the compression connection can loosen. Any of those is a reason to replace the 511-246-340 instead of re-torquing it.

Match it by number, because Weil-McLain uses more than one pilot shut-off valve. The 511-246-345 is a different part, a 1/4-inch NPT male by female pilot line manual shut-off valve, while the 511-246-340 is the Kinco-Balon P2R with the 1/8-inch male by 1/4-inch compression connections shown on the LGB supplement. Before replacing it, shut off the main gas, let the pilot go out, loosen the compression nut carefully, fit the new 511-246-340 with approved pipe sealant on the male thread, restore the gas and leak-test every joint with a bubble solution before you relight. This is work for a qualified gas technician.

Key Benefits

OEM Weil-McLain part: The 511-246-340 is the factory number Weil-McLain shows for the Kinco-Balon P2R pilot shut-off valve.
Isolates the pilot line: Lets you shut the pilot gas for service and seasonal shutdown without touching the main gas train.
Compact manual valve: A paddle thumb handle, 1/8-inch male connection and 1/4-inch compression nut keep it small enough for the tight pilot tubing run.
Clear identification: Separate from the 511-246-345, so you can order the right valve by number.

Common Questions

What is the Weil McLain 511-246-340?
It is a manual pilot shut-off valve, the Kinco-Balon P2R shown on the LGB-6 to LGB-20 Series 2 control supplement parts list as both the pilot shut-off valve and the leak test valve, with a 1/8-inch male and 1/4-inch compression connection.

Is it the same as the 511-246-345?
No. The 511-246-345 is a separate pilot line manual shut-off valve with a 1/4-inch NPT male by female connection. Order the 511-246-340 only when the old valve is a Kinco-Balon P2R or is specified under that number.

How do I know the old valve needs replacing?
A stiff or seized handle, gas odor at the valve, or a bubble test that shows leakage at the seat or connections means the valve should be replaced. Always leak-test after the repair.

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.