The TR100/140C Triton II Air Relief Strainer - 3/8 Inch by Pentair is designed for optimal use with Triton II and Triton C-3 Fiberglass Sand Filters, specifically models TR100C and TR140C. Measuring 1-1/4 inches in diameter by 7/8 inches in height, this strainer is compatible with filters produced after November 1999. The 150035 model ensures efficient air relief, enhancing filtration performance and longevity. Ideal for maintaining clean, debris-free pool water, this strainer is a vital component for any Triton Sand Filter system.