Argyle Suction Catheters with Chimney Valve Covidien provides hospitals and alternate care facilities the broadest, highest quality line of open suction products on the market. The chimney style valve has a large opening on the control vent that minimizes residual suction. Catheters are available in two tip styles - the smooth, atraumatic DeLee Tip with staggered eyes, and the angled Whistle Tip. All Covidien suction products are latex-free.