General Use and Prep Inlet Filters are good practice to filter your solvents to prevent pump damage. These 316 stainless steel filters provide that protection. Their large surface areas also mean longer life without pump cavitation. Because filters should be changed periodically, we make it easy to replace them, with no tools needed. For those filters using a plastic nut, thread the nut into the filter and finger tighten. Other filters have stems, allowing easy insertion directly into your inlet tubing.