Screw locking instructions

The locking provisions below are provided on all Wrekin Tristar, Highway, Unite, and Hercules manhole covers and gully gratings.

The cover and frame can typically be drilled and tapped in the locations shown below.

Additinoally, screw locking can be provided as a factory fitted item. Please advise our sales team of your requirements at point of order.

Drill through the cover and frame with an appropriate sized drill bit.

Drill through cover with appropriate clearance drill bit.

Tap frame with appropriate hand tap.

Place washer over set screw, apply grease to set screw and lock using appropriate hex key.