Basin Wrench 18309 15mm x 22mm Bonu Type - Rolson Tools
DURATECH Telescopic Basin Wrench, Adjustable Jaw Capacity of 3/8" to 1-1/4"(10mm to 32mm), with 10" to 17" (250mm to 430mm) Extendable Handle, Sink Wrench for Tight Space : Amazon.co.uk: DIY & Tools