Yep, plumbing adapters and toilet pan connectors make great carb/airbox boots! I also love Clarke's Rubber. So many great and useful things - grommets aplenty, chair leg plugs fit handlebars perfectly, walking cane tips come in different sizes and work perfectly as muffler bungs, tons of foams, rubbers and so on to make various cushions/protectors etc, and of course all the hose you could want...