Qosina introduces new barbed check valves - Qosina announces eight barbed check valves to their line (#80500-#80507). With a low, 0.087psi crack pressure, the barb to barb straight and reducing configurations are made of MABS and silicone. The female luer lock to barb and the barb to male luer lock configurations are made of SAN, MABS and silicone. All check valves accommodate 1/8in and 3/32in ID tubes. Visit Qosina.com today to request samples.