A 750 gallon low profile one compartment septic tank with the tees already installed
The Norwesco 750 gallon preplumbed one compartment septic tank with low profile design, part number 43520, is a green polyethylene septic tank 92 inches long, 60 inches wide and 51 inches tall, weighing 269 lb empty. 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, which is the point on 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 and backs it with a 5 year warranty. The service limit is 130 F (54 C). 750 gallons of water weighs 6255 lb, which is why a tank like this is set empty and filled in the hole.
Is 750 gallons the size your permit calls for? 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
One compartment, 750 gallons, is the size many health departments accept for a small dwelling or a cabin, and a common holding or pump tank size on larger systems. Your permit, not this page, decides whether a one compartment tank is allowed where you are; many jurisdictions now require two compartments for a primary septic tank, in which case the preplumbed 750 gallon two compartment low profile tank is the same shell with a baffle wall. Preplumbed suits a homeowner, a first time installer or any job where the crew 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 one compartment tank with loose plumbing is the same tank with the tees shipped loose. The IAPMO and CSA B66 approvals guide explains what the IAPMO listing means to a plumbing inspector.
What to check before you buy
- The permit. Send the model number 43520 to your health department 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 the tank as the backfill goes in around it, 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.
Sizes nearby
Same shell with a baffle: the 750 gallon two compartment preplumbed tank and the 750 gallon two 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 269 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 43520 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 43520.
See this tank
Product video. Watch the Norwesco 750 Gallon Preplumbed One Compartment Septic Tank with Low Profile Design - IAPMO Certified video (57 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.
