About this item Universal For MS Protein Separator:Fine workmanship, suitable for all types of MS protein separator. Function:The air valve can be more effective fine adjustment of air inflow for protein skimmer. 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. High Quality:Our aquarium protein skimmer air valve is made of high quality plastic material, sturdy, durable and long service life. 100% Satisfaction Experience:If there are any quality problems with our product, please contact us and we will promise to re delivery or refund.