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This tee fitting from Marshall Excelsior lets you branch an LP gas line while adding excess-flow protection, which shuts off gas flow if a downstream line is severed or a fitting fails.
It's configured with a female POL x female POL x 1"-20 male thread x 1/4" female inverted-flare port, and ships with a plug for whichever port you're not using.
Confirm the port configuration matches your existing LP gas fittings before installing.