GROCO BM-9 Monel Basket - 3.1" x 11.3"

The GROCO BM-9 Monel Basket is a replacement raw water strainer component designed for serious cruising and fishing vessels that demand reliable through-hull cooling and washdown systems. After thousands of hours on the water, any angler or boater knows that saltwater corrosion is the silent killer of marine systems—this strainer basket protects your engine intake and deck washdown lines from debris, sand, and biological growth that can clog or damage delicate valves and impellers. Built by GROCO, a brand trusted across commercial and recreational fleets, the BM-9 addresses the most common failure point in raw water systems: the strainer basket itself.

Constructed from Monel—a copper-nickel alloy prized in marine applications for its superior corrosion resistance—this 3.1" × 11.3" basket withstands prolonged saltwater exposure where standard stainless steel can pit or degrade. The Monel material resists dezincification and galvanic corrosion, ensuring years of service in both freshwater and offshore environments. The basket's efficient mesh design provides high flow capacity while capturing sediment and biological material before it reaches your raw water pump or heat exchanger, maintaining water pressure and cooling system efficiency even in murky anchorages or near kelp beds.

This replacement basket is ideal for owners performing routine maintenance on GROCO strainer housings or those upgrading from corroded original equipment baskets. Installation is straightforward—simply unscrew the strainer bowl, lift out the old basket, and drop in the BM-9, then reassemble and check for leaks. Weight of just 1 lb makes it easy to carry aboard as a spare, and having a replacement on hand before a crossing means you're never stranded with a clogged intake at sea. Whether you run a full-time cruiser, a fishing charter, or a weekend coastal wanderer, this basket is a smart insurance policy for worry-free raw water operation.