SurgiVet Closed Wound Vacuum Drains (Silicone). Used for post-operative drainage. May be used in conjunction with closed wound vacuum devices. Very popular wound drain. Radiopaque. Ideal for use with Continuous Suction Bulbs (GSB100, GSB150 or GSB400). Sterile. Available in two sizes with 60cm long connecting tubes; CWVD0720 7mm 20cm or CWVD1320 13mm 20cm.