L.C. Penner Co. closures will protect your pipelines and tanks from dust, insects or mold. Introducing our new Tri-Clamp Plastic Dust Caps for clamp type fittings. Available in three colors: Red, White and Yellow. Threaded closures are available for bevel seat in Red, White or our traditional Black, with or without chain. These closures feature a unique anti-slip grip for easy opening or closing. Also available is our original Gray Clamp-Type closures for clamp type fittings or flow verters.