Summary

These topics contain basic information about the types of 
fitting available in modern supply pipes:

	1	Pipe connection method
	2	Fitting an isolating valve
	3	Fitting a one-way check valve

Tools
As per chosen method.	

Materials
Isolating valve, double check valve

Step 1 - Pipe connection method	
There are various ways of connecting pipes which don’t 
have to be exclusively used. A Compression joint is simple 
to use but it is more expensive. 

Step 2 - Fitting an isolating valve
When fitting a new appliance or fixture you must fit an 
isolating valve somewhere in the pipework, preferably near 
the fixture. This then allows only that appliance to be 
very quickly isolated in the event of a fault. This fits 
in a similar way to a compression fitting.	

Step 3 - Fitting a one-way check valve
If there is a possibility of back siphonage, such as when 
a shower is fitted, you must fit a double check valve. 
This prevents water flowing in the opposite direction into 
the system and must also be fitted to a new outside tap. 
An outside tap, however, now comes with a double check valve 
built in. Check with the manufacturer’s instructions to 
confirm this.