WVA-003 MotorVac Wind/Water Leak Diffuser. For finding wind/water leaks. Smoke Diffuser Made of molded polyvinyl, the smoke diffuser is resistant to chemicals and abrasion. Slows and concentrates the EVAPro smoke for use in diagnosing wind and water leaks in vehicle passenger compartments. Included with: WV604, WV605, WV608, EELD601, #WVA03.