Perko Clam Shell Ventilator Stainless Steel 1 5/8in x 1 1/2". The Perko Clam Shell Ventilator is a Perko brand product and is made with top quality materials and construction to provide you with a product that will last you for years. For a great way to make sure you are working with one of the best products the maritime market has to offer choose the Perko 0315DP1STS Clam Shell Ventilator Stainless Steel 1 5/8in x 1 1/2". Features of Perko 0315DP1STS Clam Shell Ventilator Stainless Steel 1 5/8in x 1 1/2" Material: Stainless Steel Finish: Polished Base Dimensions: 1-5/8" x 1-1/2" Opening Height: 7/16" Opening Width: 7/8" Package Contents: Perko 0315DP1STS Clam Shell Ventilator Stainless Steel 1 5/8in x 1 1/2" Perko 0315DP1STS: Clam Shell Ventilator Stainless Steel 1 5/8in x 1 1/2"