Endoscopic fluid applicator includes outer conveying device, it between channel with extending through proximally and distally, that is the internal diameter that is defined of its length direction, inner prop plug device, which has, is located at proximal end and elongated piston element and from the handle to distal end, namely the outer diameter that is defined of its length direction and shape are relative to external delivery device channel, in order to receive wherein. The elongated piston element makes with length, when being contained in the topical administration instrument channel, extend at least substantially with the conveying device outside distal end. Delivery apparatus and inner plunger form mutual interference engagement and are fully contained in topical administration instrument channel substantially only in elongated piston element outside proximal part.
