rmm: This may well for the auxiliary breather vent line or crankcase impulse line back to the tank . You will have to forward further Model Designation info . There are a few Homelite Enthusiast's within the Forum who can give you detailed info once they have this necessary data.

The UT# is 105064. S/N 780370220. I found a parts diagram. It says that there should be a duck bill check valve there. Does anyone know where I can get one? The part # is 69451 or 89451, its hard to read. Thanks

Bill normally handles all Homelite issues. Have not seen him on the forum of late unfortunately . I know you can find one on the Chainsawer.com web site , check it out !

I found the part on Ebay, thanks for the help.