To Suit 12" Twinwall. Designed and tested to meet latest UK and European standards. Corrosion resistant. Tank shells guaranteed for 25 years with a design life of 50 years. Heavy duty shells enable installation in all ground conditions. Easy access turrets for maintenance and servicing (Turret guards optional). Various alarm types available (Required by EN858-1). Variable invert depths and inlet/outlet configurations to suit individual site conditions. Vented turrets dissipate excessive fumes and vapours.