Clark Pump Seal and O-Ring Kit BasicPart Number 7% & 10% KIT HP S&O Basic While the Clark Pump is designed to run for many thousands of hours, the seals may need to be replaced. For the mechanically minded individual, we offer a seal kit to replace the seals in the Clark Pump for the Ventura series, Cape Horn Extreme, Catalina, and Newport Series. This kit eliminates many of the parts that are not used during a Clark pump overhaul. This kit does not include membrane seals, Strainer