An apparatus and a method for selectively sealing a conduit. The apparatus includes a housing, a selectively actuatable seal assembly, a seal assembly carrier for conveying and actuating the seal assembly, and a selectively actuatable connection between the seal assembly and the seal assembly carrier. The method includes providing the apparatus, connecting the housing with a fitting, advancing the seal assembly carrier to position the seal assembly in a conduit, actuating the seal assembly to seal the conduit, actuating the actuatable connection to disconnect the seal assembly from the seal assembly carrier, and retracting the seal assembly carrier. The method may further include advancing the seal assembly carrier to engage the seal assembly, actuating the actuatable connection to connect the seal assembly with the seal assembly carrier, actuating the seal assembly to unseal the conduit, and retracting the seal assembly carrier and the seal assembly from the conduit.