... no liquid is suctioned back to the tubing and suction unit, effectively prevent cross infection and protect the medical staff ... endoscopy mask 7. check valve 8. tourniquet (radial artery compression device ) 9. loss of resistance syringe 10. suction liner Certifications: ... and sales team 80% products exportation, Main customers from EU, US, AU, AF, AS, etc100 % Factory price, Quantity discount, ...