Glass Adapter Grommets 14mm Male → 18mm Female Adapter

designed to convert between popular joint sizes for bongs, dab rigs, bowls, and accessories. Whether you need to size up, size down, or fit mismatched joints, these adapters provide a seamless, airtight connection. Made from durable borosilicate glass with frosted joints for a secure grip, they are essential tools for any smoker or dabber looking to expand compatibility across multiple pieces