Many companies combine these services, and some plumbers are also able to trade as gasfitters and drainlayers. This includes apprentices who hold limited certificates and are still training under supervision. Some people on the register may be qualified in all three trades, but each trade is separately licensed and registered. There have been many advances in the technology used by plumbers, gasfitters and drainlayers.
Materials nowadays are easier to use.
Safety is an important issue in the sector, and the equipment designs used for mains pressure hot water systems, for example, have taken that into account. More rigorous building codes also mean that the prevention of sewerage backflow and water supply protection is far more controlled these days. This protects the health of those involved in this kind of work, as well as that of the public. Gasfitters now use computer programmes to control gas installations, and they also need some knowledge of the electronic equipment used in this work. The government is presently reviewing the legislation that covers occupational licensing and gas safety.