The Norwesco septic adapter with SCH40 threading, retaining nut, and EPDM gasket is the small part that decides whether a septic tank connection seals or seeps. It creates a gasketed pipe penetration for SCH40 plumbing: the EPDM compression gasket does the sealing, and the threaded nut locks the assembly in place. It weighs just 4 lb and arrives in a compact 8" x 8" x 10" package, but it does real work at the connection point.
What you are getting
This is a Norwesco-brand adapter built for SCH40 pipe connections, supplied with a threaded retaining nut and an EPDM compression gasket. As the nut tightens, the gasket compresses against the tank wall — that compression seal is what keeps effluent inside the pipe run instead of weeping around the penetration. EPDM is a proven gasket material for septic service, which is exactly why Norwesco pairs it with this adapter rather than leaving the penetration to an improvised grommet or a bead of sealant. One thing the spec sheet does not state is the connection size, so confirm your pipe size against this adapter before ordering — call 866-418-1777 and we will verify the match.
The mistake to avoid
The most common failure at a septic tank connection is not the tank — it is an unsealed or improvised pipe penetration. A gasketed mechanical adapter is the correct approach: tighten the nut evenly so the EPDM gasket compresses uniformly, and avoid over-torquing, which can distort the gasket and open a leak path. And do not guess at fit — an adapter that almost matches your SCH40 pipe is a leak waiting for its first wet season. Confirm the size with us first.
Sizing the rest of the system
If you are still selecting the septic tank itself, our Tank Sizing Calculator and Tank Sizing Guide will get the capacity right, and our guide to Norwesco IAPMO and CSA B66 septic tank approvals covers how Norwesco septic approvals map to US and Canadian plumbing codes.
This adapter ships from Sheldon, IA — the same Norwesco plant our Norwesco septic tanks ship from, so add it to your tank order and it rides the same LTL shipment with no separate freight decision. Freight is quoted live to your ZIP with the Freight Cost Estimator, or call 866-418-1777 and we will spec the connection with you before you order.
