This 300 gallon underground septic pump tank is designed for stationary, below-grade 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. Built from polyethylene using an ANSI/NSF 61 approved resin, it provides a reliable, single-compartment holding chamber that arrives preplumbed and ready to connect, reducing on-site labor and the risk of fitting errors during installation.

At 48.5'' W x 48.5'' D x 53'' H, the tank fits a compact footprint while delivering 300 gallons of capacity. The grey polyethylene construction is suited for underground environments, and the tank is rated for liquids up to 130 degrees F / 54 degrees C.

The tank ships preplumbed with a 4'' gasketed PVC pipe inlet, a 4'' gasketed PVC tee assembly outlet, and a 20'' manway cover for access during installation and service. The gasket-and-tee plumbing system creates secure, leak-resistant connections without requiring field-fabricated fittings. Installers should consult the available technical drawing and site selection and preparation documentation before beginning excavation and placement to confirm soil conditions, burial depth, and local code requirements.

Key Features:

• 300 Gallon Capacity: Provides a dedicated 300 gallon pump chamber suited for underground septic system applications where effluent must be pumped to a secondary treatment or dispersal area.
• Preplumbed with Gasketed PVC Fittings: Arrives with a 4'' gasketed PVC pipe inlet and a 4'' gasketed PVC tee assembly outlet already installed, simplifying field connections and reducing installation time.
• 20'' Manway Cover: The included 20'' manway cover provides access to the tank interior for inspection, pump placement, and routine service without requiring excavation of the full tank.
• ANSI/NSF 61 Approved Resin: The polyethylene resin meets ANSI/NSF 61 standards, confirming it has been evaluated for use in contact with potable water system components.
• Underground Stationary Design: Engineered specifically for below-grade, stationary installation, with a maximum allowable liquid temperature of 130 degrees F / 54 degrees C.
• Compact Square Footprint: The 48.5'' W x 48.5'' D x 53'' H profile keeps the burial footprint manageable while delivering full 300 gallon pump tank capacity.

This 300 gallon polyethylene septic pump tank is a practical choice for contractors and property owners who need a preplumbed, underground pump chamber that is ready to connect on arrival. Review the available site selection, preparation, and installation documentation to confirm proper burial conditions before installation.