Made of Glass, Crystal Clear.
Suction cups is not included
Easy to installation.
Give your aquarium an elegant general appearance.
I will put an sticker at the top of the check valve to prevent stopper inside damaging the check valve during shipment.
Please remove the sticker carefully in order to prevent the check valve from damage.
Check valve must place up right when use. Check valve body with sharper end is downward, where has a clear plastic ring inside. The side without clear plastic ring is upward.