The Wells SM3-WL0230 Pre-Filter Cage helps support effective filtration by holding the pre-filter material securely in place during operation. Designed as a replacement component for compatible Wells equipment, it provides structural support for the pre-filter and helps maintain proper airflow through the filtration system. The cage allows air to pass through while supporting the filt... https://partsfe.ca/wells-sm3-wl0230-pre-filter-cage/2-SM3-WL0230.html