If you need one there are lots to choose from here.......http://www.asap-supplies.com/search/raw+water+strainer
make sure you havn,t got one , before you buy , they can be bolted to the engine and have solid tops, we are constantly cleaning out raw water strainers ,even though we have grilled intakes on the legs, have had shrimps living in there once!,so can,t hurt fitting one, and there not expensive
ps keep a scoop fitting fitted, it will help with the water pickup.