Product Details: The Parker-Hannifin 6100 Series 3/4" Body Size High Flow Quick Coupling is designed for submersible pump applications. This quick coupling features a bonded valve seal that is durable under full pressure connect and disconnect, a visual connection indicator and low spill flush valves. With this quick coupling is perfect for high flow applications. The hex size 2 is 4.06", making it easy to install and use. This quick coupling is reliable and efficient, making it the perfect choice for your submersible pump applications. FleetPride is your First Click in Heavy Duty®.