4 x $59.25 NZD
Instant Bank 
12 months interest free 19L Stainless Steel Accumulator Tank
Can be mounted anywhere in your pressurised water system. Designed to be used in any low pressure water system and recommended when using with hot water shower systems.
The accumulator tank maintains a more even and steady pressure. The on-off cycling of your pump is greatly reduced. Tank incorporates an internal bladder which can be pressurised with air.