Understanding the Plumbing Category (ID: 133)
The Plumbing category, identified by the numeric ID 133, is a specialized segment within the Google Product Taxonomy designed to classify items used in the installation, maintenance, and repair of water and sewage systems. Its full path within the hierarchy is Hardware > Plumbing, placing it at the second level of the taxonomy tree. Assigning this category correctly helps Google understand the function of your items, ensuring they are surfaced effectively for users searching for home improvement, repair, and utility components.
What Belongs in the Plumbing Category
The Plumbing category is intended for a broad array of components that facilitate fluid transmission and water management. Examples observed in the US market include various pipe fittings and connectors, such as malleable iron nipples, PVC couplings, and push-to-connect brass fittings. Also included are essential fixture hardware items like bathroom faucet units, kitchen sink sets, and replacement cartridge assemblies for valves. Repair and maintenance supplies are also central to this category, encompassing pipe repair kits, drain repair kits, and specific valve components like toilet fill valves. Additionally, specialized irrigation and water management equipment, such as mechanical water timers, outdoor sprinkler controllers, and pool water levelers, are classified here. Water filtration systems, including countertop reverse osmosis units and water filter pitchers, also fall under this grouping when used for residential water treatment.
What Does Not Belong in the Plumbing Category
It is important to distinguish this category from its neighbouring entries to avoid misclassification. Products that are strictly Building Materials (such as bulk lumber, roofing, or siding) belong in their own category. Similarly, items categorized under Power & Electrical Supplies should not be listed as plumbing, even if they are used in a utility room. Tools, such as pipe wrenches, drills, or soldering irons, must be mapped to the Tools category, not here. Heating, Ventilation & Air Conditioning equipment should also be separated, as should Hardware Pumps, which constitute their own distinct category in the Google taxonomy despite their obvious connection to water movement. Items related to Fencing & Barriers, Storage Tanks, or Fuel Containers & Tanks belong in their respective dedicated segments rather than under general plumbing. Always verify if an item is a dedicated tool or a bulk material before assigning it to the Plumbing category.
When to Use a Subcategory
Because the Plumbing category is a high-level classification, it is often best practice to use one of its more specific subcategories for improved relevancy. The category contains over 70 deeper sub-segments, such as Plumbing Fixtures, Plumbing Pipes, Well Supplies, and Plumbing Hoses & Supply Lines. If your product is clearly defined, such as a dishwasher connector hose or a deep well submersible pump, you should map it to the most granular subcategory available rather than the broad 133 identifier. This helps ensure that the specific attributes Google expects—such as technical dimensions or compatibility specifications—are properly aligned with your item.
How to Implement in Your Feed
To assign the category in your Google Merchant Center feed, you must use the google_product_category attribute. You have two options for the value: either the numeric ID or the full path. Using the ID is generally preferred as it is language-independent. The accepted values for this category are:
- ID: 133
- Path: Hardware > Plumbing
The google_product_category attribute is technically optional; if you omit it, Google will attempt to categorize your products automatically. However, automated categorization is often imprecise. By providing this attribute yourself, you gain control over how your items are classified. Remember that this attribute is distinct from the product_type attribute, which is a free-form field for your internal organizational needs and does not serve as a replacement for the official Google taxonomy. Properly categorizing your items does not dictate who sees your ads, but it does influence which policies are applied and which product data fields are prioritized during the review process.