Seachoice Clam Shell Vent 1-3/4" S/S 50-16141 by Seachoice $2.85 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Seachoice Clam Shell Vent #50-16141 Polished Stainless Steel Size: 1-21/32" x 1-3/4" x 7/16" Great For Covering Cables Screws: #6