Hi all just wanted to add my opinion on the single screw comps. Having had quite alot of experience on these machines i found that they are as reliable as any other screw on the market. I se what people say about howdens and they are too a very good machine but the hallscrew has proved when installed in the right way and correctlly engineered job they are no problems. Infact i carried out a inspection on a HS2020 that had been running for 8 years with 25,000hours and there was'nt a thing wrong with it. The customer was over the moon as a simple inspection could be done with out striping the whole compressor down. With the new range these comps will Be seen alot more...so watch out.......