Active Aqua Rubber Grommet - Pack of 25

Select the size that matches the outside diameter of your connector or fitting. The 1/2" grommet is for use with 1/2" connectors — commonly used with black vinyl tubing lines, air line pass-throughs, and compact reservoir fittings. The 3/4" grommet suits a 3/4" fill/drain fitting, which is standard for mid-range port configurations. If you're using both sizes in your system, order a pack of each.

Use the Active Aqua Titanium Step Drill Bit to create a hole sized to match the grommet's outer diameter, then press the grommet firmly into the hole until the lip seats flush against the surface on both sides. The rubber material will compress slightly during installation and expand to grip the hole edge, creating the watertight seal. Insert your fitting or connector through the grommet center — no additional sealant is required under normal conditions.

Signs of a worn grommet include visible cracking or hardening of the rubber, seepage or moisture around the fitting base, and fittings that feel loose or shift in the port. Rubber grommets degrade over time — inspecting them at each nutrient change or when removing your reservoir cover is a simple way to catch failures before they cause leaks.

Yes — these grommets are designed for use in hydroponic systems where continuous contact with nutrient solutions is expected. The rubber material is resistant to moisture and the chemical environment of standard hydroponic nutrient formulations under normal operating conditions.

Yes — the 1/2" and 3/4" sizes are standard dimensions used across many hydroponic brands and DIY system builds. As long as your connector or fitting matches the grommet size and the port hole diameter is drilled to match, these grommets will work in any compatible setup regardless of brand.