The Carlisle IntelliSpray Filter Custom 4X16 7/8X1/2E 341026 is a part of the IntelliSpray system, which is a modern spray foam equipment that ensures accurate and consistent spray performance. The filter is designed to remove any impurities or contaminants from the spray foam materials before they reach the spray gun. The filter has a custom size of 4 inches by 16 inches, and a 7/8 inch by 1/2 inch end fitting.