Perko Locker Ventilator Round 3-1/4" Chrome 0330-DP2-CHR by Perko $11.55 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Perko Locker Ventilator Round 3-1/4" #9-0330DP2CHR Chrome Plated Brass Screw Size: #6 R.H.