The HVM-B pre-assembly tool and the EO-Karrymat are reliable devices for quick, safe and easy assembly of original Ermeto fittings. HVM-B: This is a simple tool for quick and safe pre-assembly of the EO-Progressive Stop Ring/Progressive Ring. The tool is very convenient and can be used on any site, provided a vice is available. The tool is suitable for the LL, L and S series, pipe sizes from 4 to 15 mm outer diameter and steel pipe and fitting materials. The weight of the HVM-B is about 7 kg (without tools). The economic production rate is up to 20 assemblies/day.