Before comparing replacement parts, identify the product and the part you already have. Look for a model number, part reference or manufacturer information on the product, its packaging or its documentation.

Two parts can look almost identical while using different fittings. A product photo is useful for orientation, but it should not be the only reason you choose a replacement.

Check the measurements that matter for the fitting. Depending on the part, these may include diameter, overall height, connection size, mounting points or the shape of the base.

A listing may offer several sizes under one product name. After selecting an option, review its description, specifications, price and availability again.

Keep your model reference and measurements together while comparing products. This makes it easier to return to a shortlist without repeating the same checks.