A 750 gallon low profile two compartment septic tank with the tees already installed, Texas approved
The Norwesco 750 gallon two compartment preplumbed septic tank with low profile design, part number 43521, is a green polyethylene septic tank 92 inches long, 60 inches wide and 51 inches tall, weighing 298 lb empty, with a moulded baffle wall that splits it into a settling compartment and a clarifying compartment. Preplumbed means the 4 inch adapter and PVC tee assemblies at the inlet and the outlet are fitted at the factory, so the installer connects pipe and does not assemble tees in the hole. Low profile means the shallow height: it goes into a hole 51 inches deep plus bedding and cover, for a lot with rock, a high water table or a gravity line that cannot run deep. Access is through a 20 inch gasketed manway. Norwesco lists the tank as IAPMO approved, carries a Texas state septic approval for it, and backs it with a 5 year warranty. The service limit is 130 F (54 C).
Installing in Texas? Call 866-418-1777 with the county and the bedroom count, or get freight to your ZIP and add it to your cart above.
Where this tank fits
Two compartments is what most health departments now require for a primary septic tank: solids settle in the first compartment and the second sends clearer effluent to the drain field. 750 gallons is the size many jurisdictions accept for a small dwelling or a cabin; your permit sets the minimum, so confirm it before you order. Preplumbed suits a homeowner, a first time installer or any crew that wants the tank ready to connect the day it is set; if the installer would rather set the tees once the pipe grades are known, the 750 gallon two compartment tank with loose plumbing is the same tank with the tees shipped loose and approvals in a longer list of states. Our guide to single compartment versus two compartment septic tanks explains the difference, and the IAPMO and CSA B66 approvals guide explains what the IAPMO listing and a state approval mean to an inspector.
What to check before you buy
- The permit. Send the model number 43521 to your health department or your Texas authorized agent before you order. They approve tanks by model, and the inspector will want the inlet invert, the outlet invert and the liquid depth from Norwesco's drawing, linked on this page under Technical Drawing.
- The hole. 92 by 60 inches at the tank, plus working room, 51 inches of tank plus bedding below and cover above. Measure the gravity line from the house to the inlet invert before the excavator arrives.
- The pipe. The inlet and outlet are 4 inch adapters with PVC tee assemblies, already in the tank. Your 4 inch sewer pipe joins the adapters on site. Mark which end is the inlet before the tank goes in the hole; the drawing shows it.
- Access. The 20 inch gasketed manway is the pumping and inspection opening. If the top of the tank will sit more than a few inches below grade, plan a riser so the lid finishes at the surface; tell us the burial depth and we will quote the riser with the tank.
- Traffic. A polyethylene septic tank goes under lawn, not under a driveway. If anything heavier than a mower will cross it, say so before you order.
Setting it
Follow Norwesco's installation instructions that ship with the tank. The usual sequence is a level bed of sand or fine gravel, the tank set with the inlet end toward the house and checked level across both diagonals, the pipe connected to the factory tees, then water added to both compartments as the backfill goes in around the tank, in lifts, so the walls are loaded evenly from both sides. Keep sharp rock out of the backfill. Fill with clean water to the outlet invert before the system goes into service; 750 gallons of water weighs 6255 lb, which is why the tank is set empty and filled in the hole.
Sizes nearby
Same shell without the baffle: the 750 gallon one compartment preplumbed tank and the 750 gallon one compartment tank with loose plumbing. One size down: the 500 gallon one compartment low profile tank. For Florida installs: the Florida only 900 gallon two compartment low profile tank.
Shipping and receiving
The tank ships LTL from Norwesco's Shawnee, Oklahoma plant, 92 by 60 by 51 inches and 298 lb on the pallet. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. At the tailgate, check the part number against 43521 on the bill of lading, look at both factory tees and the manway gasket, and walk round the shell for transit damage before the driver leaves.
Questions before you order? Call 866-418-1777.
Freight and documents
Ships from: Shawnee, OK. LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
Technical drawing (PDF) for Norwesco 43521.
See this tank
Product video. Watch the Norwesco 750 Gallon Two Compartment Septic Tank with Preplumbed and Low Profile Design - IAPMO Certified video (74 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
