Most PVC under sink siffons have a preformed connection point where most people connect the dishwasher's hose. The ones I encountered had a tapered pipe point

Most PVC under sink siffons have a preformed connection point where most people connect the dishwasher's hose. The ones I encountered had a tapered pipe point for several diameter drains. You saw off to the matching diameter of your hose. Often you would also put on a flowback protection valve so dirty water from e.g. draining a full sink would not get into to hose of your appliance.