<ul><li>Our plumber to attend site to fit 4 no. 22mm inline McAlpine non return valves onto water heaters to&nbsp;prevent bad smells throughout the building. &nbsp;</li></ul><p><strong>Breakdown</strong></p><p>Labour: &pound;170.00</p><p>Materials: &pound;79.20</p><p>Our total cost to carry out the above works in&nbsp;normal working hours shall be</p>