The LEPP-SH Series from Caplugs (Buffalo, NY) is designed to mask both leading and exit threads with a single part. Featuring large pull tabs on one end, the LEPP-SH Series is easy to install and remove. The series is available in more than six sizes to accommodate standard catalog thread sizes, and the plug is rated for temperatures up to 600° F (315° C).
www.caplugs.com; 888-CAPLUGS