ST-SEB008 Recommended for hulls 1m to 1.3m in lenght. Displacement 5.4 cc Bore 12 mm Stroke 12 mm Valve type: Slide valve Compatible boiler B2F Length 115 mm Width 70 mm Height 100 mm Weight 1.5 lbs
ST-SEB012 Recommended for hulls 1m to 1.5m long. Displacement 9.0cc Bore 12 mm Stroke 12 mm Valve type: Slide valve Compatible boiler B2F Length 150 mm Width 125 mm Height 88 mm Weight 2 lbs