The Hozelock 4716B Pulsar Plus Comfort Knapsack Sprayer has the following specification: Size: 17 litre Max. Fill Level: 16 litre* *This is to allow sufficient air gap for pressurisation. The Hozelock Pulsar Plus Comfort Knapsack Sprayer offers maximum comfort. Unique ergonomic design with a curved tank and reinforced, adjustable carry straps. Easy to use, both left-handed or right-handed. Fitted with a 1 bar pressure regulator. It offers easy pumping action, the perfect compromise between power and frequency with an ergonomic handle. With a lockable lever that can be used either in use or in storage. Specification 4712B: 13 litre, Max. Fill Level: 12 litre* 4716B: 17 litre, Max. Fill Level: 16 litre* *This is to allow sufficient air gap for pressurisation.