Spares/repairs in northern spain

South of Gijon
https://www.caravanasprincipado.es/contacto/

Another option
https://autocaravanascostadamorte.com/es/contacto/

If you're in Vitoria-Gasteiz there's a Leroy Merlin store about twenty minutes walk from the motorhome parking area. They have a good selection of stuff and you should get fixed up ok. Be very careful, they have a lot of big boys toys that you don't need but you'll want.

Thanks for help. Was in the Picos mountains but got to Leroy Merlin in Gijon today. Bought a dishwasher hose that was about 25mm but had a rubber bit at each end. Cut it in half and put rubber end on tank and secured with jubilee clip. Found a little 3/4 inline tap, like what you'd use on a washing water supply and it basically screwed into the cut end of the hose, secured again with clip.....

Thanks for all the help. Much appreciated

I've had to do some DIY repairs like that over the years and it's great to get one over on the ripoff merchant dealers and it usually works better, heading to Leroy Merlin myself shortly to pick up a few bits in Portugal