Joint.A common joint used with the plastic pipe is called a push fit ‘O’ ring joint. Jointing on pipework is carried out by all professional plumbers each day as a quick method of connection to save time and effort but also keeping the integrity of the system that they are working on. The joints are bulkier than a welded joint and can be pulled apart easily. The fittings have a small ‘O’ ring in a groove which double seals the joint and grips the pipe. Advantages.There are advantages to be had from the use of plastic piping in a plumbing job. The obvious one is the weight which negligible and then there is the ease wit which someone, actually, anyone can mark and cut the pipework. Now although the plastic pipes are light and easy to cut, they are also very strong and provided they are connected in the right way they are very reliable, in fact so reliable that they can be used in a domestic central heating system. A Kilburn Plumber can fit plastic piping. They can also be used for hot and cold tap water supply. Plastic pipework tend to creak less when they expand underneath the floor and are ok to safely connect to copper, steel or lead pipes without any adverse reaction. Lastly they are more frost resistant than metal pipes.A great and abundant choice of these plastic pipes running into quite literally dozens exists on the market. Sizes of these pipes relates to its outside diameter. Pipes that supply water mains running either, through the house or underground use 15mm/22mm and 28mm. The overflow from toilet systems and tanks in the loft used 21mm pipes. Waste water pipes from wash basins are usually 32mm in diameter. The soil (sewer) pipes from toilets are 110mm in diameter. Kilburn Plumbers work with plastic pipework for a all domestic uses.“