The John Deere Dubuque Tractors 320, 330, 420, 430 & 430 LP have a unique style hose clamp known as a Spring Clamp or the Corbin Clamp. These clamps are particularly difficult to install and remove with standard pliers due to the spring action involved in the clamp. But there is a special tool available to make the job a breeze, Our Pliers. The tips of the tool are the secret!  They have specially designed pockets to grip the Corbin clamp and swivel to allow ease of installation and removal. The Pliers also feature a ratcheting lock mechanism to ease hand strain during longer compression times.