A grommet description containing only the number 3 is incomplete. Confirm whether it means a quantity, catalog designation or dimension with a stated unit.
Use a drawing to specify the mounting-hole size, panel thickness, passage and flange clearance. For a grooved part, the flange normally overlaps the opening; overall diameter alone does not determine mounting fit.
Choose the compound for the actual temperature, fluids and outdoor exposure. Service life cannot be inferred from the size or a general rubber description. Follow the installation and inspection requirements and verify any required sealing or retention.
