The thicknesses of the water pipe and tube walls can vary. Pipe wall thickness is denoted by various schedules or for large bore polyethylene pipe in the UK by the Standard Dimension Ratio (SDR), defined as the ratio of the pipe diameter to its wall thickness. Pipe wall thickness increases with schedule, and is available in schedules 20, 40, 80, and higher in special cases. The schedule is largely determined by the operating pressure of the system, with higher pressures commanding greater thickness. Copper tubing is available in four wall thicknesses: type DWV (thinnest wall; only allowed as drain pipe per UPC), type 'M' (thin; typically only allowed as drain pipe by IPC code), type 'L' (thicker, standard duty for water lines and water service), and type 'K' (thickest, typically used underground between the main and the meter). Because piping and tubing are commodities, having a greater wall thickness implies higher initial cost. Thicker walled pipe generally implies greater durability and higher pressure tolerances.
I had called Ben Franklin to fix a pin hole leak in the meter horn. Booking an appointment was very easy and the crew (Sid and Brandon) showed up on time. They quickly found out that a stop valve was not working and had to be replaced as well. Sid clearly explained my options and the charges upfront. He dealt with the city for water shut off, went about the job in a quick and efficient manner. Sid was very professional and explained clearly what he was doing. He patiently answered all my questions. Brandon was very practical and frank. As they were finishing up (I had to leave the house for an hour) they spotted a leak in another valve and fixed that also. I thought it was highly ethical of them to do so. Thank you Sid and Brandon!
Curtis did an excellent job in identifying the problem and providing a couple solutions. We discussed both and came to a mutual agreement, rather than him explicitly saying this is the only option and charge excessive amount. Curtis was very easy to talk to; even though I had lots of questions he was very professional throughout. He was prompt to the appointment, although I forgot about the time, he reached out and waited until I arrive. I would highly recommend their services for your plumbing needs!
In the United Kingdom the professional body is the Chartered Institute of Plumbing and Heating Engineering (educational charity status) and it is true that the trade still remains virtually ungoverned; there are no systems in place to monitor or control the activities of unqualified plumbers or those home owners who choose to undertake installation and maintenance works themselves, despite the health and safety issues which arise from such works when they are undertaken incorrectly; see Health Aspects of Plumbing (HAP) published jointly by the World Health Organization (WHO) and the World Plumbing Council (WPC). WPC has subsequently appointed a representative to the World Health Organization to take forward various projects related to Health Aspects of Plumbing.
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.