... comfort and transparent for visual assessment OXYGEN DELIVERY SERIES ADJUSTABLE VENTURI MASK CAT NOSIZEDILUTERPCS/CARTONGW&NWCS-04-01XL6 diluters 507.0 ... , simple delivery of variable oxygen concentrations.Features six color-coded diluters:24%,28%,31%,35%,40% and ... 7-ft. oxygen supply tubing.Kit includes mask, high humidity adaptor, oxygen tubing and six, color-coded diluters. adjustable venturi mask