| 摘要 |
A vent plug comprises a thermoplastics tubular body 2 for insertion in an aperture in the lid of a battery having at its upper end an integral lid 4 and having a gas venting aperture 6. A removable insert 12 is secured within the tubular body and defines a tortuous gas venting path. The insert and the body are constructed to define a space with which the gas venting aperture and the gas venting path communicate, the space accommodating a porous flame retarding body 30. <IMAGE> |
