Riva Pump Wedge, 2-degree/155mm ID, SD, RXP/RXT/GTX These Pump Wedges substantially improve the top-speed of The craft 1~2mph. The precision-machined 2-degree wedge trims up The pump nozzle raising the bow of The craft for less drag. RIVA Pump Wedge features a unique double-sided lip to retain silicone sealant and prevent cavitation. Constructed of aircraft grade anodized aluminum.