I have a strainer on my (older) Catalina, and it looks like the photo posted by SD, and I like it. Keeps out seaweed, plastic bags, etc.
But I was talking with a yard-mate who rigged his Starwind differently, for ease of maintenance. His raw-water intake is a plain through-hull and ball valve, and it is fitted with a pipe pointing straight up that terminates above the waterline.
That pipe ends in a T-fitting mounted sideways. Raw water is piped to the mesh strainer and pump from the T's "bottom." The upper end of the T is capped.
Periodically, he removes the cap, opens the ball valve to the through-hull, and pokes out barnacles and other crud with a long stick.