Conbraco/apollo Seacocks
Conbraco/Apollo 78-118-01 Sea-Flange Ball Valve 1 Inch Full Flow Marine Seacock
Conbraco/Apollo 78-116-01F Sea-Flange Bronze Ball Valve 1-1/2 Inch Full Flow
Why Conbraco/Apollo Seacocks Are a Trusted Below-Waterline Choice
When it comes to anything installed below the waterline, there is no margin for error. A failed seacock can sink a boat, which is precisely why serious mariners turn to Conbraco/Apollo — a manufacturer with roots stretching back to 1928 and a reputation built on precision flow-control engineering. The seacock category represents one of the most safety-critical applications in marine plumbing, and Apollo's dedicated sea flange valve lineup was purpose-built to meet that standard.
The Apollo Sea Flange Valve Line
Apollo's flagship marine seacock is the Full-Flow Sea Flange Ball Valve (78-Series), an 85-5-5-5 bronze ball-type valve engineered to replace older plug-style seacocks in the boating industry. The design centers on a full-bore flow path that minimizes pressure drop, making it equally at home on engine cooling intakes, raw-water strainer inlets, bilge pump lines, and cockpit drain fittings.
Key engineering details that set these valves apart include:
- Chromium-plated bronze ball — resists damage from marine growth and corrosion in both fresh and salt water.
- RPTFE seats and seals — provide smooth, low-friction actuation without requiring lubrication.
- Blow-out-proof stem design — a critical safety feature that prevents the stem from being ejected under pressure.
- Stainless steel lever and hardware — corrosion-resistant operating handle paired with a bonding screw for proper electrical bonding to the vessel's grounding system.
- Winterizing drain plug — a center-tap drain built into the valve body allows easy cold-weather blowout without removing the valve.
- Triangular sea flange — pre-drilled mounting flange seats flush against the hull for a secure, low-profile installation.
UL Listing and ABYC Compliance
Apollo seacocks carry an Underwriters Laboratories (UL) marine listing and use all ABYC (American Boat and Yacht Council) recommended materials, with all wetted metallic components in bronze — a critical distinction, since brass fittings are prone to dezincification when exposed to seawater and are not recommended for below-waterline use. The valves are backed by a 5-year warranty and are proudly manufactured in the USA.
Replacement Handles and Serviceability
Apollo also offers rubber-coated stainless steel replacement handles designed to fit specific Apollo seacock models, so a worn or damaged handle doesn't necessitate replacing the entire valve assembly — a practical advantage for long-term vessel ownership.
Whether you're doing a refit, replacing aging tapered-plug cocks, or specifying hardware for a new build, Conbraco/Apollo delivers the engineering pedigree and marine-grade materials that below-waterline fittings demand. Browse the full selection of marine seacocks to find the right size and configuration for your vessel.