Outside Plastic Pressure Chamber, Suction Valve – Inside, H.D.P.E. TANK : 16Liters Capacity Pump develops sufficient pressure in the pressure chamber for better liquid displacement. Pump is centrally situated outside the tank. Bigger filler hole of the tank facilitates better cleaning after use. Easy operated & Comfortable : It is Light Weight that anybody, even woman or old man can use, Smooth in operation and its anatomically designed for greater operator comfort during long hours of use. It has comfortable back-rest cushion to rest on operators back. Comes with adjustable shoulder strap. It can be operated with left or right hand pump lever action. Movable grip is provided in the handle for better operation. Quality : Its tank is blow molded from virgin material (H.D.P.E.) for perfect strength necessary for high reliability. All the brass parts are made from higher quality brass.