Hello All, At the moment my son's home has a upvc condensate vent pipe. This pipe feeds down the cavity (brick outer/timber inner!) to a 'suitable' distance from external ground but as sod's law decrees it has sprung an internal leak presumably at the 90 degrees bend. My boiler has a 15mm copper vent pipe so my question is...Can I replace his upvc pipe with a 15mm copper run thus eliminating any chance of leaks. Thanks. mikew070319