Raritan PHHBII Manual Head combines the reliability of theirworld renowned piston pump with the comfort of a household size bowl. All units come standard with a slow close seat as well as locking tabs to keep the seat stable while the boat is rocking. Atelescopic handle can be extended for full leverage and tucked away after use to conserve space.Pump material is made of a durable engineered polyer making it one of the most durable units on the market today. All units have a dry flush option and may be installed above or below the waterline. Every unit is individually assembled and tested in the USA Simple design means economical, trouble-free quiet operation Easy to clean and maintain