Single width. For 200 Series Service Head. Barrier included (may not be needed on single service applications). Base has a 3/4" trade size knockout for connection fo FIT insert. Also includes scrub water gasket. NOTE: Assembled with scrub water gasket. For use on tile or carpet floors. FIT Series Poke-Thru requires a minimum 2 1/32" (52mm), 2 1/8" (54mm) maximum diameter hole.