Next week we're running our first gas line using a 330-B and Viega fittings. Warehouse with uni strut already up. One of the units we have to pass through is an antiques dealers shop full of antiques (junk). Not relishing wrenching oily pipe 20' up off a ladder (no room for a sizzler lift), I decided to try this technique. First thing Monday I'm going to check to see if the local inspector has any issues. Will report back with pictures.