Avantech's closure advantages are as below
a. no need to use fire when installation . It is dangerous to use fire at underground and sealed space, it may be explosion if the air has marsh gas.
b. healthy to installer. when use fire to seal the closure heat shrink tube, it has poison gas and it may cause the lung cancer
c.  save installation & maintain cost: less 1 min to made one closure. 
d. Installation Quality control: Same finished sealed quality after installation even made by different installer, or the new installer without much closure installation experience. 
e. Closure Quality: Ours has been testing and approval by Chunghwa Telecom