Clamps for Clamp Together Ductwork Our rolled-lip pipe and adjustable sleeves take the stress out of fitting your ductwork system. Our clamps are made here in the US from stainless steel and have an EPDM rubber gasket included and remove the need for screws, bolts, and even most tools. The clamps are used to seal the pipes and fittings together. Designed for repeated use, they can be easily removed in case your ventilation needs to be moved or modified. The diameter of the clamps range anywhere from 3" to 24" and can be selected in the drop box above. Call for a quote on adjustable clamps. Feeling overwhelmed and ready for us to take over? Click here for a free ductwork project consultation and quote.