Radio frequency tubing sealer

In a radio frequency tubing sealer adapted to dividing and sealing of a fluid conveying tube by radio frequency dielectric heating and having two jaws for contacting and compressing the fluid conveying tube while applying the radio frequency dielectric heating to the tube during a sealing operation, an improvement comprising:

• at least one selectively engageable insulator sleeve adapted to being engaged on a jaw of the tubing sealer in a relationship with the fluid conveying tube to be sealed intermediate the jaw and the fluid conveying tube and having a wall with a wall thickness which insulates the fluid conveying tube from the jaw to cause the tubing sealer to divide and seal the fluid conveying tube and create a thin, easily tearable, web when the selectively engageable insulator is engaged and to divide and seal the fluid conveying tube and create a thick web when the selectively engageable insulator sleeve is disengaged.