90mm Metric Pipe Cap
SKU: PVC-CAP-90
- Commercial Termination: Provides a permanent, high-strength seal for the end of massive 90mm metric PVC plumbing runs.
- Metric Precision: Sized specifically for 90mm metric pipe (approx. 3.5" OD), the standard for commercial Reef Octopus discharge assemblies.
- Industrial Strength: Manufactured from high-impact, thick-walled grey UPVC for maximum durability in professional pump rooms.
- Saltwater Safe: 100% non-corrosive and chemically inert; won't leach toxins into sensitive reef environments or aquaculture systems.
- Streamlined Design: Smooth, rounded exterior prevents snags and provides a clean aesthetic for large-scale filtration racks.
- Ideal For: Sealing 90mm manifold headers; capping unused commercial skimmer ports; industrial pressure testing.
90mm Metric Pipe Cap
The 90mm Metric Pipe Cap is a high-capacity termination fitting engineered for professional water management in massive aquarium systems, public exhibits, and industrial aquaculture facilities. Specifically designed for 90mm Metric PVC pipe, this cap is the industry-standard solution for sealing the ends of primary manifold headers or closing off discharge ports on the largest commercial Reef Octopus protein skimmers.
In high-volume life support systems, the integrity of every termination is critical to prevent significant leaks and maintain system pressure. This cap is built to withstand the heavy vibrations and water hammer typical of 90mm plumbing runs powered by high-performance commercial pumps. Constructed from industrial-grade grey UPVC, it provides significantly better impact resistance than standard white residential fittings and perfectly matches the "factory" aesthetic of professional filtration equipment.
Key Features
True Metric Calibration: Fits 90mm OD metric pipe—essential for maintaining and modifying commercial Reef Octopus and European-spec systems.
Heavy-Duty Construction: Industrial UPVC is designed for permanent immersion in saltwater without degradation or chemical leaching.
Precision Interior: Molded to ensure a square, full-depth seat on the pipe, ensuring a straight and professional-looking termination.
High-Surface Bonding: The deep socket provides a massive surface area for a secure, permanent solvent weld.
Streamlined Design: The low-profile, rounded exterior is ideal for clean plumbing runs in tight filtration racks.
Ideal For
Commercial Manifolds: Permanently sealing the ends of 90mm distribution blocks.
Industrial Skimmers: Closing off unused recirculation or drain ports on massive Reef Octopus units.
LSS Expansion: Capping off 90mm "stubs" designed for future filtration modules or exhibit tanks.
What’s Included:
(1) 90mm Metric Pipe Cap
Specifications:
Size: 90mm
Connection Type: Slip (Socket)
Material: Industrial Grade Grey UPVC
Compatibility: 90mm Metric Pipe ONLY
- Ensure the 90mm metric pipe end is cut perfectly square and thoroughly deburred.
- Perform a dry-fit to confirm the pipe reaches the bottom of the internal socket.
- Apply a generous layer of PVC primer to the pipe end and the internal socket of the cap.
- Apply a liberal coat of heavy-duty solvent cement (rated for large-diameter pipe) to both components.
- Push the cap onto the pipe and rotate slightly (approx. 1/4 turn) to ensure even glue distribution.
- Hold firmly for 60 seconds. Allow at least 8 hours of cure time before introducing high-pressure water.
Pro Tips:
- Metric vs. Standard. A 90mm metric cap will not fit standard 3-inch or 4-inch USA pipe. 90mm is a specific metric outer diameter (approximately 3.54 inches). US 3-inch pipe is 3.5 inches OD, while US 4-inch pipe is 4.5 inches OD. Always verify your pipe diameter with a caliper before beginning your installation.
- The Union Strategy. If you are capping a main line that you expect to expand later, consider installing a 90mm Metric Union just before the cap. This allows you to unscrew the cap and continue your plumbing run in the future without needing to cut into your main 90mm header.
- Professional Aesthetics. Use clear PVC primer rather than purple to maintain the professional, industrial look of the grey UPVC. This matches the factory aesthetic of high-end commercial Reef Octopus equipment for a clean, professional finish.