... design to avoid blocking; 3.crown tips,8mm diametre connecting tip; 4.offer OEM. descriptionTransparent moulded Yankauer suction handle ... flat end,this is the crown/round oneFeaturesThis suction connecting tube is designed with hex-arris, avoiding blocking the ... tube duo to high vacuumflat tip, vented.available with connecting tubeSterile, individual packagmore sizes are available ,you are welcome ...