- Protecting your products during the manufacturing process is key to ensuring your products remain operational. At Essentra Components, we've got you covered, with our extensive range of Caps. Our range includes end caps, tapered and threaded caps and more, all manufactured in various materials. Can't decide on which solution you need? View our range of guides and handy tips, Ultimate Guide to Caps & Plugs and Design Engineer's Guide to Caps & Plugs.