Most good water quality will recommend replacing a gate valve regardless of its condition. The time to discover if it will work is not during a flood in your bathroom. If you have it replaced with a ball valve then check your water heater and laundry valves, too. Have them replaced at the same time with premium ball valves. Ball valve laundry bibbs make it easy to shut off the water to the washer after each use which may help to prevent floods in the future.
There are two, one on each side of the toilet, closet bolts which hold the toilet to the floor. If there are caps over the bolts, remove or pop them open. Using a small crescent wrench unscrew the nuts from the bolts. Alternate side to side when unscrewing this will be much more important when reinstalling the water line repair bolts but alternate anyhow.
Leaks can occur anywhere in your reverse osmosis water filter system. If this ever occurs, check the source of the leak. It may be from the hoses, fittings and the valves. Most of the time, some kind of tightening might be necessary. So make sure to securely tighten the fittings. If this does not work, you may need to replace the filter itself, however that might take a bit more work.
Dishwasher. To check water leakage on your dishwasher, you will need several sheets of paper placed underneath the machine before operating it. When the machine stops, check the sheets of paper you placed underneath to see it they are wet. If so, call a maintenance person to repair the leak immediately. It is important also for you to remember that regular dishwasher uses 15 gallons on every wash load. Make sure that when you use it, the load is full.
One tip is to avoid hiring a plumber, who is a part or who is representing a company. They usually work on a commission basis. The company usually has a flat rate for every plumbing service and the plumber's commission will be added up to the company's charge. This is one of the main reasons why some plumbers charge you with a ridiculously high amount of money for their services. Opt for freelance water line repair plumbers instead. They work for themselves, so the price is usually negotiable.
Keep your hands clean and dry. Plumbing jobs get slippery, so it's important to work with a pair of sturdy gloves so you don't lose your grip and accidentally hurt yourself or break something.
A large plumbing job, such as re-piping or installing additional fixtures, may require a permit. Check with your city's department of building and safety before asking for estimates, and avoid any plumbers who are reluctant to comply with regulations.