The seawater strainers for the generator and air conditioners in Stella Blue are made by Marine Hardware. They are model SEASUM0.750.
From the manufacturer: Universal Swivel Mount Raw Water Strainer with housing cast of 85-5-5-5 naval bronze offers maximum utility on your boat. A pull-out strainer screen assembly gives easy spill-proof maintenance. The heavy-walled, high strength plastic bowl securely fastens to the manifold with a bronze retainer ring plate.