Round Hole Aquarium Drain Fitting (25-50mm) | High-Flow Flush Bottom Bulkhead | Seafood Pool & Sump Plumbing

Round Hole Flush Drain Fitting for High-Density Tanks

Experience unrestricted water flow with our Round Hole Drain Fittings, exclusively sourced for Atradesen.com. Specifically engineered for high-density breeding tanks, seafood holding pools, and large aquariums, this fitting features an open-hole design (no slotted grill) to ensure massive water turnover and absolutely zero clogging from heavy fish waste.

🌊 Maximum Flow & Smart Plumbing

• Unrestricted Round Hole Design: Delivers incredibly smooth and rapid drainage. Perfect for heavy bio-load setups where thorough, blockage-free waste removal is critical.
• Space-Saving & Flush Mount: Sits compactly against the tank bottom to save valuable swimming space. Available in both Straight and Elbow profiles to fit tight under-cabinet clearances.
• Versatile Drain Switch Setup: Connect it with a standard PVC ball valve below, or simply plug the top hole with a rubber stopper for a highly effective, low-cost manual drainage switch.

⚠️ Sizing & Drilling Guide (Crucial!)

To guarantee a 100% leak-proof installation, please follow the Atradesen.com exact drilling specifications:

• Glass Clamping Capacity: Safely secures to glass or acrylic panels between 3mm and 15mm thick using the included gaskets.
• Size 25: Interface O.D. 25mm | Drill Glass Hole: 20-25mm
• Size 32: Interface O.D. 32mm | Drill Glass Hole: 27-32mm
• Size 40: Interface O.D. 40mm | Drill Glass Hole: 35-40mm
• Size 50: Interface O.D. 50mm | Drill Glass Hole: 45-50mm