Use on the intake side of your canister filter. Quietly removes surface sludge and protein build-up. This product can hook up to any canister filter with flow rate up to 200 gph. Eheim filter 2217 requires part to tee off the intake and eheim filter 2250/2260 requires part to tee off the surface extractor. Connects to 12/16 mm tubing or 3/8" id tubing.