The manhole is secured by a transverse beam which is attached to the centre of the cover. This ensures even distribution of the holding down force to form a gas tight fitting to 2.5psig.

171 Series are manufactured by MTP in our UK manufacturing plant to exacting quality standards and backed by over 40 years experience. Sizes range from 18″ (450mm) to 24″ (600mm).

MTP 171 Series of non-sparking low pressure manhole covers provide easy access to low pressure storage tanks for maintenance and cleaning purposes.