AGD has been supplying kit to the piling specialist for the last five years.
Ivor King took delivery of its first Giken silent piler in 2012 with the ECO700S model.
A flurry of deals followed for Gilken machines boosting the fleet to five with three super crush attachments worth around £6m in total.
The latest order is for a new RTG RG21T telescopic leader rig.
This machine features a massive 750hp engine which allows the rig to operate either a 150 tonnes resonance free variable moment vibrator or a 15 tonne metre CFA rotary head with optimum performance installing either sheet piles or CFA piles to 21 m depth in a single stroke.
The machine is currently being assembled at the RTG factory and is scheduled for delivery in February.