Jabsco Twist 'n' Lock Manual Head, Marine Toilet Twist 'n' Lock safety handle and flush control lever, reversible pump mounting for choice of right or left handled installation Powerful swirl action for efficient flushing Full sized external seal housing allows quick clean seal replacement and instant access to pump cylinder Powerful self-priming pump for above or below waterline installation Crevice free contours and smooth mouldings for added hygiene Automatic vacuum breaker for easier pumping Angled pump housing and long stroke for more comfortable operation