Sleipner Overview All / Upgrade Kits / Propeller Upgrades All Thruster Packages AC Thrusters DC Thrusters Hydraulic Thrusters Electrical Components Spares Tunnels and Flanges Upgrade Kits Propeller Upgrades Pro Upgrades - Variable Speed IPC Upgrades Q-prop upgrade kit SP55 £122.21 Add To Cart Q-prop Upgrade kit SP75/95 £234.24 Add To Cart Q-prop Upgrade kit for SP125 £637.24 Add To Cart Q-prop upgrade kit for SP155/200/220HYD £637.24 Add To Cart