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This product is engineered for non-electrical applications where you don't need extra parts like adjustable ends or batteries. It's a pretty streamlined piece of equipment.

No check valve is needed and no extra fittings are part of the setup. Concentric Rockford built this one to function without those added components, so you're not hunting down supplemental parts before you can put it to work. What you get is a straightforward unit that keeps the install clean and simple.

Think of it as a basic, non-electrical Concentric Rockford Inc. item built to do its job without extra add-ons like adjustable ends, a battery, diodes, or remote control.