This is a 38mm diameter stainless steel polygonal flexible exhaust pipe for coupling with larger diesel generator sets. Currently, this unit will fit the Hyundai 3000RPM units,the DHY6000SE(LR) and the DHY8000SE(LR) generators models, but it is always worth checking the bore size before buying. The unit is supplied as is, and does not include the clamp or bolt required to fit it to the genset. This must be supplied by the end user, and fitted at source to ensure the integrity of the clamp. Although we do not supply the clamp, we can suggest an exhaust u-bolt or similar, as a suitable fitting for this pipe. NB. This exhaust extension is designed to provide an adequate means of funneling harmful emissions and fumes to a suitable outdoor environment, however it IS NOT designed to protect life, and should NOT be used to vent exhaust fumes out from an environment where human or animal life may dwell, and therefore be put in danger.