<ul>
	<li>Operatives to apply protective sheeting to work routes and working areas.</li>
	<li>Isolate heating services.</li>
	<li>Apply freeze machine to pipe work.</li>
	<li>Freeze pipe work.</li>
	<li>To remove and replace defective valve.</li>
	<li>Wait for pipe work to unfreeze.&nbsp;</li>
	<li>Test for correct working order.&nbsp;</li>
	<li>Site to be left clean and tidy.</li>
</ul>
