PROBLEM TO BE SOLVED: To provide an inside plug capable of obtaining back suction easily and effectively.SOLUTION: A spouting device 1 comprises: a cylinder 2 filled with a paste material a nozzle 7 provided at a tip part of the cylinder 2 a plunger 3 provided inside the cylinder 2 and movable back and forth inside the cylinder 2 an inside plug 4 for preventing leakage of the paste material, which is provided at the tip side of the plunger 3 and formed of an elastic material a main seal part 22 which annularly protrudes outward in a radial direction of the cylinder 2 from a body part 21 of the inside plug 4, and closely contacts with the inner peripheral surface of the cylinder 2 at all times and an auxiliary seal part 23 which is provided at an interval at the rear side of the main seal part 22, has an outer diameter slightly smaller than the inner diameter of the cylinder 2, and annularly protrudes outward in the radial direction of the cylinder 2 from the body part 21 of the inside plug 4.COPYRIGHT: (C)2015,JPO&INPIT【課題】容易にかつ効果的にバックサクションを得ることができる中栓を提供すること。【解決手段】注出器1は、ペースト材を充填するシリンダ2と、該シリンダ2の先端部に設けられているノズル7と、シリンダ2の内部に配設されシリンダ内を前後動可能なプランジャ3と、該プランジャ3の先端側に配設されペースト材の漏れを阻止し、弾性材料で形成された中栓4とを備えている。中栓4の本体部21からシリンダ2の半径方向外側へ環状に突出し、シリンダ2の内周面に常時密着する主シール部22と、該主シール部22の後方側に間隔を開けて設けられ、かつシリンダ2の内径よりも僅かに外径が小さく形成され、中栓4の本体部21からシリンダ2の半径方向外側へ環状に突出する補助シール部23とを備えた。【選択図】図1
