During the decade of the 1980's, the waterworks industry was introduced to the Resilient Seated Gate Valve, a design principle that is dominant in preference for use in distribution systems. M&H Valve Company was at the forefront in this industry-wide movement by introducing the Style 4067, our AWWA C509 Resilient Seated Gate Valve.

With the end user in mind, M&H introduced a redesign of the 4067 in 2001. The goal of the redesign was to eliminate the customer need for any anti-rotational bolts. M&H did this by designing a machined elliptical bolthole in place of an as-cast opening. This elliptical design allows valve installers to slide a standard sized bolt into the slot, therefore eliminating the need to have two different types of bolts on the installation.