Protect your lab equipment and maintain system integrity with Lab Pro’s Flange Plug Caps. Designed for secure sealing of flanges and tubing ends, these durable caps prevent contamination and leaks in various laboratory and industrial applications. Available in multiple sizes and materials. Browse our selection below. For bulk pricing, contact us at 888-4-LABPRO (888-452-2776). Next-day service in California and same-day service for will-calls.