GROCO Pressure Storage Tank - 3.2 Gallon Drawdown

The GROCO Pressure Storage Tank with 3.2 Gallon Drawdown (Model PST-3A) is a precision-engineered pneumatic accumulator designed for marine, RV, and mobile water systems where consistent pressure delivery is critical. This tank solves a common problem in pressurized water applications: waterlogging and pressure fluctuation. By maintaining a stable air charge separate from system water, it eliminates the surging and inconsistent flow that occurs when air and water mix directly in traditional tanks.

At the core of this tank's performance is a durable rubber bladder that acts as a pneumatic separator, keeping the charged air compartment isolated from the pressurized water supply. The 3.2-gallon drawdown capacity means the tank delivers 3.2 gallons of water at usable pressure before the pump cycles back on, reducing pump cycling frequency and extending pump life. The PST-3A is engineered with marine-grade construction to withstand vibration and salt-air environments. Weighing 21.85 lbs and measuring 17 x 16 x 21 inches, it fits compact engine rooms and utility compartments while providing substantial storage volume and pressure stabilization for small to mid-sized systems.

This accumulator is ideal for boat owners, RV enthusiasts, and anyone operating pressurized water systems in mobile or marine applications who demands smooth, quiet operation without the water hammering and on-off cycling of traditional tanks. The drawdown rating ensures adequate reserves between pump cycles, improving user experience during peak demand periods. Installation requires matching the pneumatic pre-charge pressure to your pump's cut-on pressure for optimal performance—a straightforward procedure documented in GROCO's technical literature. Compatible with standard water system piping connections, the PST-3A integrates seamlessly into existing fresh water or pressurized supply networks.