A clear, tough, flexible tubing Excellent for air conditioning condensate drains 23°F (-5°C) to 149°F (65°C) service temperature range 1/4″, 3/8″, & 1/2” tubing have a 21 PSI working pressure & 58 PSI burst pressure 5/8″, 3/4″ & 7/8″ tubing have a 14 PSI working pressure & 43 PSI burst pressure