Not sure about a sea water filter on the 2400. The head uses sea water but no strainer. Some of the 2400ís came with air conditioning and there is a strainer on the intake but no filter. The only filter is on the freshwater pump and most are a washable element.
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2