AquaLabs CO2 Check Valve Marine Aqua Natural Gravel Substrate is

Aqua Natural Gravel Substrate is a high-quality natural gravel substrate designed to provide a durable

diffuser with bubble counter and non-return valve

The tongs feature a strong grip

ceramic bearings for quiet durability and compatibility with aquariums up to ~700 L (depending on model version)

helping to maintain clear water and protect downstream media in both freshwater and marine aquariums

AquaLabs CO2 Check Valve Marine Aqua Natural Gravel Substrate isThe AquaLabs Stainless Steel CO2 Check Valveallows peace of mind in preventing the back flow of water into the regulator. It also offers quick release functionality for ease of use.