Once the code is inserted and saved, refresh the GSDT to run the test again to ensure that the product schema and aggregateRating is showing up well. There should not be any errors present in the schema In cases where metafield is not present in a Shopify store (syndicated stores) A different set of rich snippet codes needs to be installed, which rely on pulling the review data from widget directly instead of the Shopify metafields:

DynaVap Glass Cooling Stem

Regular price $20.00
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Shipping calculated at checkout.

DynaVap Glass Cooling Stem

New Colors IN STOCK!

These custom made glass stems are designed to cool the vapor from the DynaVap tip. The dimples in the glass create more surface area for the vapor to traverse and cools the temperature along the journey. Our stems are 75mm (3") in length, which is the same length as the XL and XLS sized DynaVap models.