The ornamental design for a faucetextensionadapter, as shown and described.
FIG. 1 is a perspective front left view of a faucet extension adapter in a closed configuration, showing my new design;
FIG. 2 is a perspective front left view of a faucet extension adapter in an open configuration;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a right elevation view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top plan view thereof.
The broken lines in drawings 1 through 6 represent threaded portions of a faucet extension adapter that form no part of the claim while the broken lines in drawings 7 and 8 represent disclaimed regions that form no part of the claim.