Cheap Insurance For Freshwater & Marine Aquariums

• Eliminates the chance of water siphoning backwards and damaging your pump or causing an electrical short
• High quality neoprene valve provides the ideal cracking pressure to reduce surging
• Easy to read directional arrow molded in durable plastic for easy flow direction confirmation
• Clear window allows function verification and visible signs when replacement is needed
• Two valves per package for about the price of one from our competitors