4 Pack - 3/4" Slip X Slip Bulkhead (AM BRAND) Heavy duty bulkhead is molded of highest impact resistant PVC eliminating possibility of finding hid 4 Pack Slip x Slip 3/4" Bulkhead Stock color is jet black to match acrylic tank backgrounds 1" 1/2" Hole diameter required All kits contain: bulkhead fitting, gasket, lock nut