I guess it must be a double thump, knot sure.
http://www.ebay.com/itm/DISTILLER-50-L-Professional-stainless-steel-STILL-moonshine-brew-copper-alcohol/291367926948?_trksid=p2047675.c100010.m2109&_trkparms=aid%3D2220073%26algo%3DSIM.MBE%26ao%3D1%26asc%3D41668%26meid%3D765268027d4847b3ac9cce2b86f63b20%26pid%3D100010%26rk%3D6%26rkt%3D6%26sd%3D272488056554