Lookin for my best opion to splice in a drain into an existing pipe. This is in a commercial building in a ceiling space. I will be putting in a sink in, on the floor above. the pipe i will need to tap into is 3" galvanized. Is it best to cut out a section and spice in or do they make a saddle fitting or sorts i could use. remember i will be working above a ceiling in a space that is about 3' high. Any advice on what my best option is.