#  Step 4: Seal 

 



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 In this page we will finish the last step of making pneumatic networks: sealing.

 Prepare the following materials and tools: a heat-sealed airbag column, connectors, a tweezer, heat sealer and a hot glue gun.

   ![finial_1](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_1.png?itok=URN34uC5) 

 

 Below is the unsealed pneumatic network.

   ![finial_2](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_2.png?itok=HNgkVkyu) 

 

 Use heat sealer to seal the airbag along the two red dotted lines. Notice that this needs two sealing operations with a 5 mm gap at center for air inlet.

   ![finial_3](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_3.png?itok=aVhuAYwL) 

 

 Fetch a connector using a tweezer.

   ![finial_4](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_4.png?itok=DXquRz-3) 

 

 Evenly smear the hot glue around a side of the connector. Notice that we need a quick finish or the glue will cool down and become undeformable and incohesive.

   ![finial_5](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_5.png?itok=rDFoGtfl) 

 

 Insert the connector into the prepared air inlet, with the smeared side towards the inlet.

   ![finial_6](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_6.png?itok=ECWP77Kd) 

 

 Press the connection area using fingers to ensure air tightness, and wait seconds for the glue to coagulate.

   ![finial_7](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_7.png?itok=BMZco0zW) 

 

 Thus, we have finished a column of pneumatic networks. It can be inflated using syringes and its air tightness can be examined by inflation under water.

   ![finial_8](/sites/g/files/omnuum4601/files/styles/hwp_1_1__960x960_scale/public/srtsandbox/files/finial_8.png?itok=dFsktJDT)