Whitecap Industries Duraplex 1-1/8 Inch 90-Degree Duplex Stainless Steel Thru-Hull Fitting - 6579X

The Whitecap Industries Duraplex 6579X is a 90-degree thru-hull fitting built from duplex stainless steel, designed to route a hose through a boat hull at a right angle while resisting the corrosion that marine environments cause over time. Duplex stainless steel combines the strength of standard stainless with added resistance to pitting and crevice corrosion, making it a durable choice for below-waterline hull penetrations that see constant water contact.

This fitting is sized for 1-1/8 inch hose and features a 90-degree barb outlet, letting hose runs turn through the hull without a separate elbow fitting. The flange seats against the hull exterior while the threaded body passes through the cut-out, and the barb end accepts hose secured with a hose clamp. It is intended for use in below-waterline plumbing runs such as bilge pump discharge, raw water intake, livewell, or washdown lines where a right-angle hull penetration is needed.

Installation requires a hull cut-out matching the fitting's specified cut-out diameter and a hull thickness within the fitting's rated maximum. Whitecap Industries manufactures the 6579X to the dimensions listed below for a consistent fit against the flange and thread length.

Specifications

• Brand: Whitecap Industries
• Manufacturer Part Number: 6579X
• Product Type: Thru-Hull Fitting
• Material: Duplex Stainless Steel
• Angle: 90 Degrees
• Hose Size: 1-1/8 inch
• Flange Outer Diameter: 1-7/8 inch
• Thread Length: 1-5/8 inch
• Barb Length: 1-1/2 inch
• Overall Length: 3-1/2 inch
• Cut Out Diameter: 1-5/16 inch
• Maximum Hull Thickness: 1-1/4 inch
• Weight: 1 pound

Fitment

This is a universal thru-hull fitting sized by hose diameter and hull thickness rather than by boat make or model; confirm your hull cut-out and hull thickness match the dimensions above before ordering.

Frequently Asked Questions

What size hose does the Whitecap 6579X thru-hull fit? The Whitecap Industries 6579X is sized for 1-1/8 inch hose, with a barb length of 1-1/2 inch to secure the hose with a clamp.

What angle is this thru-hull fitting? It is a 90-degree fitting, so the barb outlet turns at a right angle from the hull flange rather than running straight through, which is useful when the hose needs to change direction close to the hull.

What material is the 6579X made from? Duplex stainless steel, a grade chosen for its resistance to pitting and crevice corrosion in continuous saltwater and freshwater contact below the waterline.

What hull cut-out size is required to install the 6579X? The 6579X requires a cut-out diameter of 1-5/16 inch to pass the fitting body through the hull.

What is the maximum hull thickness this fitting supports? The Whitecap 6579X is rated for a maximum hull thickness of 1-1/4 inch.

How long is the 6579X overall? Overall length is 3-1/2 inch, with a thread length of 1-5/8 inch and a flange outer diameter of 1-7/8 inch.

How much does the 6579X weigh? This thru-hull fitting weighs 1 pound.

Is the 6579X thru-hull fitting universal or boat-specific? It is a universal fitting sized by hose diameter, cut-out size, and hull thickness rather than by a specific boat make or model, so any hull meeting those dimensions can use the Whitecap 6579X.

What is the difference between duplex and standard 316 stainless steel thru-hulls? Duplex stainless steel, used in the Whitecap 6579X, offers higher resistance to pitting and crevice corrosion than standard austenitic stainless grades, which matters for fittings that stay submerged continuously.

What applications is the 6579X thru-hull fitting used for? A 90-degree thru-hull like the Whitecap 6579X is used for below-waterline hose runs such as bilge pump discharge, raw water intake, livewell, or washdown lines where the hose needs to turn at a right angle through the hull.

Does the 6579X come as a single fitting? Yes, the Whitecap 6579X thru-hull fitting is sold as an individual unit.