The new Jabsco Twist Lock design uses a remodeled piston in the pump-out assembly. At the end of normal pumping out, at the bottom of the pump stroke, the user simply turns the handle through 90Deg. which locks the piston down onto the base outlet valve keeping it securely shut. Turning the handle to the normal operating position opens the lock again. Twist lock action safety handle guards against flooding and waste backflow by locking the waste outlet valve shut. Reversible pump mounting allows re-assembly for left hand operation by installer. Powerful self-priming, double-acting piston pump. Strong swirl action for efficient flushing. Crevice free contours and skirted base for added cleanliness and hygiene. Contoured handle and conveniently positioned flush control lever for ease of use. Angled pump housing and long stroke for easier pumping. Spring assisted top valve closure for easier priming. Automatic vacuum breaker operated by flush control lever for easier bowl emptying. Constant 38mm (11/2") bore waste path minimizes blockages. Aortic joker valve combines full 38mm (11/2") bore with automatic backflow prevention. Multi-angle discharge elbow for ease of installation. Accessible mounting points for faster installation. All fastenings face front or top for superbly simple servicing without need for special tools. Renewable external seal housing for quick, clean replacement of seal and piston rod guide. Positively located gaskets ensure correct re-assembly. Dual function base plug combines winter drain point with easy cleaning access. Materials: Luxury wooden seat and cover with tough baked enamel coating. Hygienic white ceramic bowl for ease of cleaning. Pump and base molded in ABS or polypropylene with selected parts in acetyl resin, fitted with 316 passivated stainless steel fastenings, brass weights and neoprene seals and gaskets. Performance: Flushing pump self-primes from dry up to 1 metre (3ft) below the base. Waste pump discharges up to 3 metres (9ft) above the base.