Explosion proof thread box plus GASKET?
If it is flameproof, it will have enough strength and no detonation when it meets the requirement. Usually sealing ring or pouring sealing type (explosion proof clay).
General is to be added, but for some products can not add, because the device itself with good sealing performance, and the sealing performance is better than the other and the seal is more reliable, of course, these are high-end products, if you are not so high-end or please seal
It is not the key to add or not to encrypt the sealing ring, mainly to see if your cable can be sealed to meet the requirements of protection and to prevent the pulling of certain torque.
