The RV Series inline Strainer filter is made of a flexible PVC housing with a 304 Stainless Steel 40 mesh screen (standard). Some sizes also have 20, 80, and 100 mesh screens available. This series comes in FNPT threads of 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, and 1 inch. The maximum operating temperature is 160º F. Made for male pipe threads.