The Thumb Tite (Part Number: 4216-92) is a versatile and reliable sealing solution designed for G21-517. This specialized formula excels in sealing, insulation, and general maintenance with its exceptional adhesion capabilities. Non-staining and non-hardening, it remains unaffected by extreme temperature variations. Compatible with various G21-517 models, this Thumb Tite ensures a secure seal, lasting performance, and easy application.