Fluidtrol SW116104031 4" x 4" Flanged FRP/PVC Strainer with Stainless Steel Basket. The SW Series is our most popular basket strainer for standard aquatic applications. The SW hair and lint strainer design has been refined over its 30+ years of production; it offers maximum performance, is user friendly and is the premier choice for many aquatic applications. The SW is available in strainer sizes up to 24” and can be configured with in-line, offset, angled offset, or boot bodies.