Sewer
This category covers PVC sewer pipe and sewer fittings for gravity sewer lines that carry wastewater from buildings to a public main or private system. It includes solvent weld pipe, solvent weld fittings, and gasketed fittings for new installs, extensions, and repairs on commercial, municipal, and residential projects.
Sewer piping products made from PVC resist the chemicals and moisture found in wastewater and do not rust or scale. Solvent weld joints chemically fuse a pipe spigot into a fitting socket, while gasketed joints seal with an elastomeric ring compressed between a bell and a spigot.
Selecting sewer pipe starts with three questions: which joint type the project specifies, which wall rating the line requires, and which existing pipe the new run must connect to. The sections below explain each product group and the planning steps for a complete install.
Sewer Pipe and Fittings Products
Solvent Weld Sewer Pipe
Solvent weld sewer pipe is straight PVC pipe with a plain spigot end and, on many lengths, a belled socket for glued joints. Common wall ratings include SDR 35 for standard buried service and heavier SDR 26 where deeper cover or higher loads apply. Check each listing for diameter, length, and standard.
Gasketed Sewer Fittings
Gasketed sewer fittings hold a factory-installed elastomeric gasket in each bell that seals against the pipe spigot without cement. The push-on joint accepts slight movement from settlement and temperature change, and it assembles in wet or cold trenches where solvent cement cures slowly.
Solvent Weld Sewer Fittings
Solvent weld sewer fittings join matching sewer pipe with primer and solvent cement to form a rigid, fused joint. They suit short runs, tight connections near a foundation, and repairs where a gasketed bell will not fit. Use PVC-rated primer and cement from Cements & Primers.
Directional and Branch Fittings
Elbows in 22-1/2, 45, and 90 degree angles change line direction. Wyes and combination wye and eighth bends add branches at a shallow angle that keeps waste moving. Long sweep patterns reduce flow restriction at horizontal turns. Tees connect vertical branches and cleanout risers where code permits.
Couplings, Caps, and Transition Fittings
Couplings join pipe ends in new work and repairs. Caps and plugs close line ends for testing or a future connection. As part of sewer connection systems, transition fittings connect to Schedule 40 DWV, cast iron, or clay pipe; use only approved fittings rated for both materials.
How Sewer Pipe Works and Where to Use It
How Gravity Sewer System Piping Works
Sewer system piping moves waste by slope, not pressure. Flow runs downhill from the building drain through the building sewer to the main, so joints must stay watertight and aligned to block infiltration and root entry and to avoid low spots that collect solids. Cleanouts at changes in direction provide access for maintenance; see Drains & Cleanouts.
Commercial and Municipal Projects
Commercial sewer pipe serves restaurants, offices, retail sites, and multi-unit buildings, where higher flows often call for larger diameters. Gasketed pipe and fittings are common on municipal laterals and mains. Ties to a public main typically require utility approval, a permit, and inspection.
Residential Projects
On homes, sewer pipe connect the house drain to the public lateral or a septic tank. Replacements and repairs often pair solvent weld fittings near the foundation with gasketed joints in longer buried runs. Check whether the local utility or code requires a cleanout at the property line.
Key Specifications and Planning Steps
Key Specifications
Wall rating: SDR 35 and SDR 26 PVC sewer pipe and fittings are made to ASTM D3034 in 4 to 15 inch sizes.
Joint type: Gasketed joints follow ASTM D3212 with gaskets to ASTM F477; solvent weld joints use PVC primer and cement.
Dimensions: Confirm diameter, length, and end type (hub, spigot, or gasket bell).
Planning Steps
1. Confirm local code, permit, and utility requirements.
2. Size the line from drainage fixture units and expected flow.
3. Set slope by pipe diameter and the code in force.
4. Set depth for underground sewer piping from frost line, cover, and traffic loads.
5. Prepare bedding and backfill per ASTM D2321 and the pipe manufacturer.
6. Gather sewer installation supplies: pipe, fittings, gasket lubricant or primer and cement, cleanouts, and test plugs.
7. Test the line before backfill where required.
Choosing the Right Sewer Pipe
Start with the joint type the job specifies. Gasketed joints suit long buried runs and wet trenches; solvent weld joints suit short runs and tight connections. Match the wall rating to depth and load, and confirm every fitting matches the pipe's outside diameter, since sewer and drain dimensions differ from Schedule 40 DWV. Review sewer pipe materials before tying into older lines and plan transition couplings in advance. Build a complete list of sewer pipe supplies before trenching so pipe, fittings, and jointing materials arrive together. For commercial work, confirm the diameter against the approved plumbing plans.
Frequently Asked Questions
Where can I source sewer pipe and gasketed sewer fittings for a commercial job?
This category lists PVC sewer pipe, gasketed sewer fittings, and solvent weld sewer fittings for commercial work. Check each listing for diameter, wall rating, and standard, and confirm quantities and lead times before scheduling the install.
Which sewer pipe and fittings do I need for a PVC sewer lateral?
A typical lateral uses straight PVC sewer pipe, couplings, elbows or wyes for direction changes, a cleanout fitting, and a transition fitting at the main or house drain. Add gasket lubricant or primer and cement, and check the material list against the approved plans.
Gasketed or solvent weld sewer fittings: which should I use underground?
Both are made for buried service. Gasketed joints allow slight movement and assemble in wet or cold trenches, which suits long runs. Solvent weld joints form a rigid, fused connection suited to short runs and tight spaces. Follow the project specification and local code.
What sewer pipe materials are used for gravity sewer lines, and when is PVC the right choice?
Common sewer pipe materials for gravity lines include PVC, ABS, cast iron, ductile iron, and vitrified clay, depending on the system's age and local code. PVC is the common choice for new underground lines because it is light, resists wastewater chemicals, and does not rust.
What is the difference between SDR 35 sewer pipe and Schedule 40 pipe?
SDR 35 sewer pipe is made to ASTM D3034, with wall thickness set as a ratio of outside diameter, for buried gravity service. Schedule 40 PVC DWV pipe follows ASTM D2665 with iron pipe size dimensions and is common inside buildings. Their outside diameters differ, so they are not interchangeable and need an approved adapter to connect.
How do I connect a new PVC sewer pipe to an existing line made of a different material?
Use a transition fitting or flexible coupling approved for both materials and both outside diameters, such as a flexible transition coupling made to ASTM C1173. Cut the existing pipe square, clean both ends, center the coupling, and tighten the clamps to the manufacturer's specified torque.
What determines how deep underground sewer piping should be buried?
Depth for underground sewer piping depends on local code, frost depth, minimum cover, traffic or equipment loads, soil type, the pipe's wall rating, and the elevation of the main. Confirm requirements with local code and the project plans, and bed the pipe per ASTM D2321.
What slope does a sewer pipe need for gravity drainage?
Required slope depends on pipe diameter, the plumbing code in force, and the system design. Under the International Plumbing Code, larger building drains may run at a smaller minimum slope than small ones. Confirm the figure with local code and the plans, and keep the grade steady to avoid low spots.
Why would a gasketed sewer pipe joint leak, and how do I fix it?
Common causes are dirt on the gasket or spigot, a rolled or damaged gasket, missing lubricant, incorrect insertion depth, and misalignment. Separate the joint, clean both surfaces, inspect the gasket, apply the manufacturer's lubricant, and push the spigot straight to the insertion mark.
How do I make solvent weld sewer joints that won't separate or leak?
Cut the pipe square, remove burrs, and clean and dry both surfaces. Apply PVC primer where required, then PVC solvent cement to the pipe and socket. Push to full socket depth, hold briefly, and allow the cure time listed by the cement manufacturer before testing.
How do I size a commercial sewer pipe?
Size commercial sewer pipe from total drainage fixture units, expected peak flow, slope, and layout, using the sizing tables in the local plumbing code. Building size alone does not set the diameter, so confirm the design with the project engineer or code official.
Should sewer pipe be glued, or is a gasketed joint better for a buried line?
Either can be correct. The joint type must match the pipe ends: solvent weld fittings join solvent weld pipe, and gasketed fittings join gasketed pipe. The choice depends on the specification, site conditions, and code; neither is better for every buried line.
What sewer fittings do I need to change direction or add a branch?
Use 22-1/2, 45, or 90 degree elbows to change direction, and wyes or combination wye and eighth bends to add branches. Match the joint type and outside diameter of all sewer fittings to the pipe, and follow local code for fittings allowed on horizontal runs.
Besides pipe and fittings, what sewer installation supplies should I plan for?
Plan sewer installation supplies such as PVC primer and cement or gasket lubricant, cleanouts, test plugs, bedding material, warning tape, and transition couplings where the new line meets existing pipe. Several of these sit in their own categories, such as cements and primers or drains and cleanouts.
What is involved in connecting a building sewer to a municipal main?
The tie-in usually requires a permit, utility approval, and inspection. Depending on the main, sewer connection systems include a wye installed in the main, a tap with a saddle, or an existing stub, using fittings the utility approves. Confirm the method before excavation.