If it actually needs repair, then you probably just need to replace the rubber o-rings on the top and the bottom.
Also, check to make sure that the chain didn't come unhooked; and make sure that the chain isn't too long and getting stuck between the o-rings, preventing the seal.
If the whole thing needs to be replaced, you can get a kit at your local hardware store.
Its not bad as long as they are not leaking. Unfortunately polybutylene pipes have the best chance to start leaking at some point and it can be costly to repair.
Just replace the ballcock valve..
Turn off the water and drain the tank. Sop up excess as needed. Remove old ballcock and install new one. Connect chain and verify slack, but not too much slack, and that the chain will not catch an anything. Turn on water and let tank fill. Flush several times and verify correct operation. Double check chain. Sometimes, the ballcock seat is bad. You can replace it, but that is usually difficult and occasionally gets out of hand. They make a ballcock with seat replacement. The seat sits on top of the old seat using some kind of putty. Ususally, you remove old ballcock, clean and dry seat, apply putty bead to new seat, and press on, following any specific directions in the kit. In all cases, you need to check the minimum drain level. There is a cup on the back of the ballcock that lets you adjust how far down the water goes before the ballcock closes. This can save water. Set it to where the flush is correct for your application.
That depends on a number of factors that can only be addressed by a gas repair technician. -But call one soon, it may be dangerous !
I have small leaks in the basement in corner of concrete the floor and concrete blocks wall.
An overflow pipe on a (toilet cistern?) will leak if the rubber disc in the ballcock slide valve needs to be replaced.
If your bathtub pipe is leaking, it requires immediate repair.
If your home radiator is leaking, it needs immediate repair.
If your toilet bowl is leaking, it requires immediate repair.
Is your garbage disposal leaking and in need of urgent repair?
If your shower pipe is leaking, it may need immediate repair.
Is your window leaking and in need of fixing?
The kitchen sink pipes are leaking and require immediate repair.
If your bathroom sink pipe is leaking, it requires immediate repair.
First you have to identify the fluid that is leaking then locate the source of the leak before we can tell you how to repair it.
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Some typical radiator repair jobs are leaking hoses, leaking radiators or loose connections.