Specifications:
TypeRS-4002RS-4003Flow Rate800L/H600L/HSuitable Tank<300L<300LMaterialPlasticPlasticHeight28cm/11.02''23cm/9.06''Tube Length49cm/19.29''49cm/19.29''Cup Size10x7cm / 3.94''x2.76''8x7cm / 3.15''x2.76''Wood Size5x2x2cm / 1.97''x0.79''x0.70''5x2x2cm / 1.97''x0.79''x0.70'' Features:- Protein Skimmer use air venturi protein separation.- Dirt and waste substance collected in the top large container.- Components: suction cups, wood air stone, and 49cm long tubing included.- You need to use this skimmer with your existing air pump (air pump is not included).- Wood air stone generates fine bubbles to separate protein and waste substance from your aquarium.
 Package included: 1 Pcs Protein Skimmer(suction cups, wood air stone, and tubing included)
 Tips:* Both of 2 models are suitable for less than 300L fish tank.* In order to achieve better bubbles generation, less than 5w air pump is recommended.* No need of cumbersome assembly, just attach the suckers to inner wall of fish tank and it works.