there called waste outlats easy to change north western caravans at handforth dean across road from b & q tel01614866055 should have them in stock take your old one to match as theres diff sizes hope is helps
alan from a c r in manchester
------------- CHECK YOUR TYRES
caravanrepairs@hotmail.com
yes you should be able too daisy
if you get under the van you will see they are screwed onto the floor with one or two screws and the pipe is pushed onto the back of the unit.
take it off and take it with you as a pattern for your replacement, that way you will get the right one.