CAT Pumps valve seat spring 32325 is a replacement spring for the valve seat inside model 7531, 7533, and 7534 unloaders. It is used to swap out one that is broken or one that is worn and causing the unloader to malfunction. Since it is constructed with stainless steel, this spring has a high resistance to corrosion. It is a genuine OEM part from CAT Pumps which ensures a proper fit in the recommended unloader models.