Im not familiar with that skimmer......but if you re just talking about a silencer for the air line...get a film canister...drill a hole in the lid and in the bottm that the air line will fit snugly in. Put some loose cotton in the center of the film canister with some space in between the wad of cotton and the holes. when you put the air lin in also make sure there is a little space in between the end and the cotton.
replace the cotton monthly or when needed. works great