Grommets 

Grommets are used to create secure, leak-free connections between various pieces of hydroponics equipment and plumbing. 

With grommets, you reduce or remove the possibility of nutrient leaks or seepage at connection points.

Grommets are essential components when attaching barbed fittings to trays, reservoirs, etc.

Use these grommets to replace old, worn grommets in your existing garden equipment, or for a hydroponics system that you're making from scratch.