http://www.vilter.com/ This is their site. I am a Vilter distributor
however we use Vilter recips alot but have not yet put in a single screw. After all the horror stories we have heard on the Hall mono screw we will need Vilter to have some track record before we spec a single screw. It does not seem like they are gaining their share of the market. We use twin screw FES or M&M at this time with great results. Most of our designs include both screws and recips. Screws for main load and recips to cycle on and off as needed to best match the loads.