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Bronze Thru-Hulls 1" Quantity in Basket: None Code: 1961 Price: $34.99 Shipping Weight: 1.50 pounds Quantity: Groco TH1000W bronze 1" thru-hull. Flange is machined and grooved to retain bedding compound. Neck is threaded approx. 3/8" from flange. For 1" pipe, flange OD 2-3/16"