This invention is provided with a receiving body, an elastic cover and a connection cylinder. The receiving body has a transport long pipe arranged in the receiving body and protruded at two sides of the receiving body and provided with a through hole and balance via. Wherein, the through hole and the balance via are respectively passed through the top end of the transport long pipe and the outer wall of the middle section. The elastic cover is arranged in the receiving body and has a stretched slit, a first bending part and a second bending part. The stretched slit is arranged at the top of the elastic cover and corresponded to the transport long pipe. The first bending part is formed at the outer circumference of the elastic cover and below the two through holes the second bending part is formed at the elastic cover located on the outer circumference below the first bending part. The connection cylinder is arranged in the receiving body with its top installed a connection hole that is engaged with the elastic cover.本發明設有一容納主體、一彈性套及一連接筒,該容納主體具有一輸送長管,該輸送長管設置在該容納主體中且突伸在容納主體的兩側並設有穿孔及平衡通孔,該穿孔及平衡通孔分別貫穿在輸送長管的頂端及中段之外壁面上,彈性套設在容納主體中且具有一伸張縫隙、一第一彎曲部及一第二彎曲部,該伸張縫隙設在彈性套的頂面且對應該輸送長管,該第一彎曲部成形在彈形套的外環面且位在兩穿孔下方,該第二彎曲部成形在彈形套位在第一彎曲部下方的外環面上,連接筒穿設在容納主體中,連接筒的頂端設有一連接孔,該連接孔與彈性套相卡合。10‧‧‧容納主體20‧‧‧彈性套30‧‧‧連接筒32‧‧‧凹槽
