This 300 gallon septic pump tank is built for underground installation in residential and light commercial septic systems where a dedicated pump chamber is needed to move effluent to a drain field or secondary treatment area. Constructed from polyethylene with an ANSI/NSF 61 approved resin, it provides a reliable, single-compartment holding chamber that keeps the pumping stage separate from the primary treatment tank, helping protect pump equipment and supporting proper system function.

The tank measures 48.5'' W x 48.5'' D x 53'' H and is designed as a stationary underground unit. Access is provided through a single 20'' manway cover, giving installers and service technicians a clear entry point for pump placement, inspection, and maintenance. The inlet is non-plumbed, so site-specific plumbing connections are made during installation. Maximum allowable liquid temperature is 130 degrees F / 54 degrees C.

This pump tank fits into a septic system layout downstream of the primary treatment tank. It is sized to hold effluent between pump cycles, which helps regulate flow to the drain field and reduces the risk of overloading the distribution system. The polyethylene construction resists corrosion underground, and the single-compartment design keeps the installation straightforward. Because the tank is not pre-plumbed, the installer connects inlets and pump discharge lines to match the specific site plan, giving flexibility across a range of system configurations.

Key Features:

• 300 Gallon Capacity: Provides adequate holding volume between pump cycles to support consistent effluent delivery to the drain field.
• Polyethylene Construction with ANSI/NSF 61 Approved Resin: Corrosion-resistant material rated for underground use and approved for contact with potable and wastewater applications.
• Underground Environment Rating: Engineered specifically for below-grade installation, keeping the system out of sight and protected from surface conditions.
• 20'' Manway Cover: Single top-access manway allows pump installation, inspection, and servicing without excavating the full tank footprint.
• Non-Plumbed Inlet: Inlet connections are made on-site, giving installers the flexibility to configure plumbing to match the specific system layout.
• 130 degrees F Maximum Temperature Rating: Defined operating limit supports safe use across standard septic system conditions.

This 300 gallon polyethylene pump tank is a practical choice for septic system installations that require a dedicated pump chamber. Its underground-rated construction, accessible manway, and non-plumbed inlet make it adaptable to a range of site conditions, while the ANSI/NSF 61 approved resin supports compliance with common wastewater system standards. Review site-specific engineering requirements and local codes before installation.