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1. 
   22mm Single Non-return Valve

   Excl. Tax: £ 5.23 Incl. Tax: £ 6.28
2. 
   15mm Single Non-return Valve

   Excl. Tax: £ 3.29 Incl. Tax: £ 3.95
3. 
   15mm Double Non-return Valve

   Excl. Tax: £ 2.26 Incl. Tax: £ 2.71