Groco PST-1 Pressure Storage Tank 2 Gallon Marine Accumulator

The Groco PST-1 is a 2-gallon pressure storage tank (accumulator tank) designed for marine freshwater and saltwater plumbing systems. This compact pressure tank uses a pneumatic bladder system to maintain consistent water pressure, reduce pump cycling, and ensure even temperature delivery in showers and faucets.

Key Features:

• 2-gallon total capacity with approximately 0.5 gallon drawdown
• Pneumatic rubber bladder separates air charge from system water to prevent waterlogging
• Steel construction with non-corrosive components for all wetted parts
• 3/4" male NPT inlet and outlet ports
• Maximum working pressure: 100-125 PSI
• Compact dimensions: 12.63" L x 8" diameter
• Can be mounted in any position including upside down
• Suitable for fresh or salt water applications
• Stainless steel mounting straps and hardware included

The PST-1 features a user-adjustable air charge that should be matched to your pump's cut-on pressure (typically 18-20 PSI for most marine pumps) to optimize performance. The bladder design ensures smooth pressure delivery while significantly reducing pump cycling, which extends motor and pressure switch life. Install anywhere in the cold water plumbing line after the pump and before the water heater.