Hydroseal, the London-based concrete pump manufacturer, has been bought back from the receiver by managing director Tony Dwyer for an undisclosed sum.Mr Dwyer has invested some of his own money in the firm and plans to build the whole range of Hydroseal mobile and trailer-mounted concrete pumps, as well as developing dredging equipment based on the pump technology.The company will be concentrating on overseas markets. Mr Dwyer said: 'There's no market in the UK so we'll sell overseas, mainly to places like Saudi Arabia and Kuwait. We expect a Middle Eastern order for two or three machines in the next few weeks and are manufacturing from now on.'Hydroseal Concrete Pumps, part of the AFD Investments Group, went into receivership in March with debts of £550,000. It was followed into receivership in June by AFD Concrete Pumps, the group's hire division.Mr Dwyer bought back several pumps from AFD's former fleet from the receiver and now runs around 25 Hydroseal-manufactured machines.The newly formed company, Hydroseal Hire, now operates from three depots in London, Stoke-on-Trent and Leeds.