Whitecap Industries 6581X Duplex Stainless Steel 90 Degree Thru-Hull Fitting with Barb, 1-1/2 Inch

The Whitecap Industries 6581X is a 90 degree thru-hull fitting built from duplex stainless steel, designed to pass a hose through the hull at a right angle while resisting corrosion in both freshwater and saltwater environments. Duplex stainless steel combines high strength with excellent resistance to pitting and crevice corrosion, making it a durable choice for below-waterline hardware where long-term reliability matters. The fitting is sized for 1-1/2 inch hose and terminates in a barb end for a secure hose clamp connection, routing water intake, drainage, or discharge lines through the hull at a 90 degree angle to simplify hose runs in tight spaces.

The 6581X has a flange outer diameter of 2-3/8 inches, a thread length of 1-5/8 inches, a barb length of 1-1/2 inches, and an overall length of 4 inches. It is rated for a maximum hull thickness of 1-1/4 inches and requires a cut-out of 1-1/2 inches for installation. At 1.8 pounds, it is a solid, purpose-built fitting for permanent hull penetrations on boats where a right-angle thru-hull is needed.

Specifications

• Brand: Whitecap Industries
• Manufacturer Part Number: 6581X
• Type: Thru-Hull Fitting, 90 Degree
• Material: Duplex Stainless Steel
• Hose Size: 1-1/2 inch
• Flange O.D.: 2-3/8 inches
• Thread Length: 1-5/8 inches
• Barb Length: 1-1/2 inches
• Overall Length: 4 inches
• Cut Out: 1-1/2 inches
• Max Hull Thickness: 1-1/4 inches
• Weight: 1.8 pounds
• UPC: 725060658137

Frequently Asked Questions

What hose size does the Whitecap 6581X thru-hull fit? The Whitecap Industries 6581X is sized for 1-1/2 inch hose, with a barb end designed to accept a 1-1/2 inch hose and hose clamp.

What angle is this thru-hull fitting? It is a 90 degree thru-hull, meaning the hose barb exits at a right angle to the hull rather than straight through, which helps simplify hose routing in tight spaces.

What material is the 6581X made from? Duplex stainless steel is used for the 6581X, chosen for its combination of strength and resistance to pitting and crevice corrosion in marine environments.

What is the maximum hull thickness this fitting supports? The 6581X is rated for hulls up to 1-1/4 inches thick.

What size cut-out do I need to install the Whitecap 6581X? A 1-1/2 inch cut-out is required to install the 6581X thru-hull fitting.

What is the overall length of the 6581X thru-hull? The overall length is 4 inches, with a barb length of 1-1/2 inches and a thread length of 1-5/8 inches.

How much does the Whitecap 6581X weigh? The 6581X weighs 1.8 pounds.

What is the flange outer diameter of the 6581X? The flange outer diameter is 2-3/8 inches.

Is the 6581X suitable for saltwater use? Yes, the duplex stainless steel construction of the 6581X resists pitting and crevice corrosion, making it suitable for both freshwater and saltwater use.

How does the hose attach to the 6581X thru-hull? The 6581X terminates in a barb fitting, and the hose is secured onto the barb with a hose clamp.