I need to renew waster connections, I have the twin outlets on my van, do the likes of B&Q sell the 28.5mm pipe that I see advertised on ebay for £7.50 so I can make it myself or is this specialised sizing pipes?
Not sure if you mean under the van or after the outlets. If after the outlets I use the configuration as in photo.
Total cost of white bits from plumbers merchant about £5, uses
2x Osma 4W260 32mm spigot bend push fit
1x Osma 4W190 32mm Tee push fit
2x short lengths piping 34mm o/d