The original ones (the benchmarks) are made right here in Auburn Hills, MI. - Torca. They make the TorcTite, the EasySeal, the AccuSeal, & the DuraSeal. I brought the AccuSeals & DuraSeals into the mainstream aftermarket in the early 2000's before anybody had them. Nobody else carries the DuraSeals - they have always been OE only & they are the strongest lap-joint band clamp in the world.

Here's my page on the clamps, *including the 2.5" butt-joint clamp the Torca Coupler: http://www.classicchambered.com/classic/AccuSeal.html

The only other size the coupler is available is 3.5". I do not carry the thinwall TorcTites or EasySeals.