Hose adapter you specify the two ends size inner diameter and outer diameter. Use for dust collection, vacuum cleaner, air lines, anywhere you need to convert. No need to buy those expensive proprietary adapters anymore. Just measure your exiting hose. Just make sure if your making a receptacle to use your measured size as inner diameter vice versa for the other way. Update: had to fix a bug in thingiverse customizer Last update 11/23/14: Last update works fine now. Thingiverse customizer doesn't support d param for cylinder, changed to radiusPrinter Brand: Robo 3DRobo 3DPrinter: R1 ABS + PLA ModelR1 ABS + PLA ModelRafts: Doesn't MatterDoesn't MatterSupports: NoNoEnter values in the prompts in customized and the rest is done for you.