GROCO BM-4 Monel Basket - 2.6" x 7.5"

The GROCO BM-4 Monel Basket is a marine-grade strainer component designed for serious boaters and commercial vessels operating in saltwater and brackish environments. This basket assembly protects critical through-hull plumbing systems—raw water intakes, cooling lines, and bilge circuits—by intercepting debris, kelp, and sediment before they reach pumps and heat exchangers.

Constructed from monel—a premium nickel-copper alloy—the BM-4 resists corrosion in the harshest marine conditions far better than stainless steel or bronze alternatives. The basket features a 2.6-inch diameter opening and a depth of 7.5 inches, providing substantial flow capacity while maintaining fine mesh screening to trap particles as small as 1/16 inch. This durable construction ensures that users won't need to replace components frequently, as it can withstand decades of saltwater exposure without pitting or degradation.

Its compact footprint of 3 x 3 x 10 inches fits standard through-hull sea chest configurations on vessels ranging from 25-foot center consoles to 80-foot offshore fishermen. The BM-4 pairs seamlessly with GROCO's cast-bronze through-hull strainer bodies, making it an ideal choice for retrofit installations and new builds in commercial fishing, yacht, and military applications.