Present-day water-supply systems use a network of high-pressure pumps, and pipes in buildings are now made of copper,[25] brass, plastic (particularly cross-linked polyethylene called PEX, which is estimated to be used in 60% of single-family homes[26]), or other nontoxic material. Due to its toxicity, most cities moved away from lead water-supply piping by the 1920s in the United States,[27] although lead pipes were approved by national plumbing codes into the 1980s,[28] and lead was used in plumbing solder for drinking water until it was banned in 1986.[27] Drain and vent lines are made of plastic, steel, cast-iron, or lead.[29][30]
Yes I do know what approximately the part is and how much but the problem is  almost all plumbers & even electricians want $100 service call.  That's ridiculous as if the part is $25 that $125 to me and that's too much but I see they want the $$$$ so they start with a service call. Example my outdoor light bulb broke and I couldn't get it out of socket.  I had to call electrician.  Yes, $100 service call, handed me the bulb and I gave him a new one to put it and that was it. Took him all of 10 min.  So now I hesitate when I need something done in these fields and thank goodness so far I'm not in need of anything..
Plumbers are expensive because it is a highly specialized trade requiring thousands of hours to master. Additionally, they make house calls meaning they spend time and money investing in vehicles, tools, equipment and gas to bring to you. They also carry insurance and have other overhead expenses. Labor shortages in the field also contribute to premium pricing.
Water systems of ancient times relied on gravity for the supply of water, using pipes or channels usually made of clay, lead, bamboo, wood, or stone. Hollowed wooden logs wrapped in steel banding were used for plumbing pipes, particularly water mains. Logs were used for water distribution in England close to 500 years ago. US cities began using hollowed logs in the late 1700s through the 1800s. Today, most plumbing supply pipe is made out of steel, copper, and plastic; most waste (also known as "soil")[21] out of steel, copper, plastic, and cast iron.[21]
“Intelligent Service replaced our two sump pumps, added digital float switches, and installed a digital wall unit to track the water levels and pump options. They also checked our existing battery backup for battery outputs. They improved the piping and fixed the check valves. They cleaned the sump pit and the work area. They did a terrific job. Will definitely use them again and will recommend them as well. Pleasure to work with, very responsive, knowledgeable staff, and did a good job explaining the work order prior to writing up the estimate.”
I want to thank Technician Sean D. and his associate Paul C. for during an outstanding job replacing some of my plumbing. They arrived on job site at the time promised and quickly determined my problem. They were both very friendly and professional. Sean was very knowledgeable as to what had to be done and made a good job an excellent job with a few tweaks. Atomic Plumbing is lucky to have employees of this caliber.

Plumbing Repair Co