FUNCTION: The air valve can be more effective fine adjustment of air inflow for protein skimmer. Professional manufacturing, stable characteristics and high reliability. Reliable Plastic: Made of durable and healthy plastic for long-time use, it causes no adverse effect to your lovely fish. Extremely lightweight to be set up without effort. Installation method: It is necessary to cut the original MS protein skimmer inlet silicone hose into two sections and connect them to both ends of the fine tuning air valve. Package Included: 2 x Protein Skimmer Air Valve Switch Specification: Condition: 100% Brand New Item Type: Protein Skimmer Air Valve Switch Material: Plastic Color: As Pictures Shown Suitable for: All Types of MS Protein Separator Weight: Approx. 17g Single Size: Approx. 5.4x3.8cm/2.13x1.50inch End Opening Diameter: Approx. 10mm/0.39inch Simple design, easy to operate and use, convenient and practical. UNIVERSAL FOR MS PROTEIN SEPARATOR: Fine workmanship, suitable for all types of MS protein separator. HIGH QUALITY: Our aquarium protein skimmer air valve is made of high quality plastic material, sturdy, durable and long service life. INSTALLATION METHOD: It is necessary to cut the original MS protein skimmer inlet silicone hose into two sections and connect them to both ends of the fine tuning air valve.