Aquadyne Rhino II 4" with Air

The Rhino II Heavy Duty Bottom Drain with Air Diffuser is one of the most durable bottom drains made in the U.S. without exceeding $1,000 or requiring expensive stainless steel. Designed for commercial-quality performance at an economical price, it is built from Schedule 80 PVC and crafted with computer-generated machine fabrication and hand-welded thermal seals for maximum strength and reliability. Whether for a beginner or an expert installation, the Rhino II ensures long-lasting dependability in any pond setup.  

Unlike mass-produced, injection-molded drains that focus on cost-cutting over durability, the Rhino II is engineered for structural integrity. It features thicker flanges, a reinforced liner attachment ring, and precision machine-fitted components that prevent flexing, cracking, or distortion. Key benefits include a full three-inch height over the discharge port for additional concrete coverage, a direct pipe connection into the air bladder, and a 1.5-inch commercial air check valve to prevent water from entering the air line.  

One of the standout features of the Rhino II is its 12-inch air diffuser, the air line is designed for optimal aeration, helping to improve water circulation, increase oxygen levels, and promote a healthier pond environment. With no injection-molded parts to weaken its structure, the Rhino II is a superior choice for a high-performance bottom drain that offers durability and efficiency far beyond cheaper alternatives.