Centek Transom Exhaust Fittings

Centek Transom Exhaust Fittings: The Last Line of Defense in Your Wet Exhaust System

When it comes to completing a marine wet exhaust system, the transom fitting is where everything meets the open water — and the quality of that fitting matters enormously. Centek has been engineering marine exhaust solutions since 1962, and their transom exhaust fittings reflect decades of design refinement built around the demanding realities of the marine environment.

Built from the Same Material as Vernatube

Centek's exhaust system fittings are made of the same fiberglass and fire-retardant resin used to produce their proprietary Vernatube tubing. The fittings are lightweight, strong, non-corroding, and durable — and their outer diameters are compatible with approved marine rubber exhaust hoses. This material consistency across the entire exhaust system is a hallmark of Centek's engineering philosophy: every component is designed to work as part of a cohesive, high-performance whole.

Centek Marine uses fiberglass reinforced plastics (FRP) because FRP will not corrode or deteriorate when exposed to gasoline or diesel fumes mixed with salt or fresh water, as many metal fittings do, nor will it warp or melt like rubber or plastic alternatives. For a transom fitting that spends its life exposed to the elements, this is a critical advantage.

Thru-Hull Fittings with Integrated Flapper Valves

Centek's transom exhaust fittings are engineered as glass reinforced plastic (GRP) thru-hull outlets designed specifically for wet exhaust systems. Each outlet is fitted with a flapper valve to help prevent water from entering the exhaust line in reverse — a real risk when a vessel is moving slowly or coming to a stop — while still allowing exhaust fumes and cooling water to exit normally.

The outlet also features a slightly longer lip at the bottom to help steer water away from the transom, avoiding unsightly water marks and staining on the hull. The mounting flange includes four bolt holes for a secure, reliable installation.

Centek's thru-hull fittings are available in multiple sizes and finishes — including white and black GRP — making them suitable for a wide range of vessel types and aesthetics, from runabouts to cruising sailboats.

Certified, Trusted, and System-Compatible

Centek has earned ISO 9001 certification, and its products carry Lloyd's Register Type Approval, while also meeting corrosion and pressure standards defined by the ABYC P-1 Construction Standards. These certifications are particularly meaningful for transom fittings, where structural integrity and water-tightness are non-negotiable.

Centek's marine exhaust accessories — including thru-hull fittings, crush sleeves, and check valves — are all designed to work in conjunction with Centek Marine exhaust systems and to withstand harsh marine environments. Whether you're building a new exhaust system or replacing a worn fitting, Centek's transom exhaust components are designed to integrate seamlessly with the broader Centek ecosystem, including their Vernalift® mufflers and Vernatube hose products.

Explore the full range of Centek marine products or browse all transom exhaust fittings to find the right solution for your vessel's exhaust system.