The pilot assembly supplies and ignites the pilot flame that lights the main burner, and part 50-4056 is the genuine Urbana IPI pilot assembly with a 4 ft propane line built for that job on the Urbana U50 and U70 gas fireplaces made from 2021 on.
Urbana's manuals call for replacing the pilot line once it's damaged rather than repairing it, since the aluminum line carries fuel directly to the pilot hood. A weak, misaligned, or failing pilot flame is also a sign this assembly needs attention, since the electrode must sit no more than 1/4 in. from the pilot hood and the flame sensor must glow bright red without touching it.
Installation should be performed by a licensed gas technician, and local codes apply.
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