I JUST SNORKELED THE BELT EXAUST, I USED A 3" RUBBER PLUMMING FITTING IT FIT RIGHT OVER THE PLASTIC BELT EXAUST TUBE, THEN I CLAMPED IT, ON THE OTHER END I USED 2" FLEX TUBING AND MADE SURE IT WAS SEALED REALLY WELL, THE FLEX TUBING ALLOWS U TO BRING IT UP HIGH WITHOUT ALOT OF CUTTING, I HOPE THIS HELPS, IF U HAVE ANY MORE QUESTIONS OR HELP LET ME KNOW...THANKS GARY