ITEM NAME:Stainless Steel Check Valve One Way Aquarium CO2 Diffuser Regulator Z a.imagelink a:hover.imagelink {color:#db3606;.Can prevent the aquarium from the water flowing back, which is caused by the decrease of CO2 pressure,and keep the function and service life of CO2 bottle. Stainless Steel check valve x 1. Material: Stainless steel.
