The Mermaid & Pirate Aquarium Supply Save-a-Fishy Siphon Safety Cap is a BPA free siphon safety cap that helps keep your fish safe from harmful chemicals. This cap features a white color and has a silicone ring that helps secure the fit. The bottom of the cap is lined with a blue material that helps reduce chemical exposure. The top of the cap features a clear plastic lens that provides a safe and comfortable viewing experience.