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A 2-inch PVC P-trap is the code-required size for shower drains, floor drains, and high-volume kitchen sinks where a standard 1-1/2 inch trap can’t handle the flow rate. Plumbers need to verify the 2-inch PVC P-trap dimensions before rough-in work, replacement fits, or code inspections. The exact size depends on whether you choose a standard model from manufacturers like Charlotte Pipe or a low-profile variant built for limited vertical clearance under a shower pan or floor drain assembly.
What Are The Standard 2-Inch PVC P-Trap Dimensions?
The most widely available standard model is the Charlotte Pipe PVC00708P1000HD, which uses a hub x hub (2″ x 2″) configuration. Its overall dimensions are 7.594 inches wide, 9.125 inches deep, and 3.188 inches tall. The fitting includes a union and plastic nut that allow adjustable positioning during installation, making it the go-to choice for residential and commercial DWV systems where standard clearance is available. Charlotte Pipe’s spec sheet for the PVC00708P1000HD confirms these dimensions plus the ASTM and NSF certifications required by US plumbing codes.
Spears Manufacturing produces an L.A. Pattern variant with a G1 hub dimension of 3-5/8 inches, and Standard Plumbing offers a Schedule 40 version with matching hub-to-hub specs. All three conform to ASTM D 1784, ASTM D 2665, ASTM D 3311, and NSF 14 standards, so swapping between them is straightforward as long as the overall dimensions match your rough-in.
Low-Profile 2-Inch PVC P-Trap Dimensions
When vertical clearance is tight under a shower pan or floor drain, low-profile P-traps save space by compacting the U-bend geometry. Ferguson offers another low-profile variant that shares the same 2-inch hub x hub connection and is rated for sanitary drain, waste, vent, sewer, and storm drainage systems.
The trade-off with low-profile traps is a slightly different flow path through the compact body. The reduced height can affect the water seal depth, so confirm with your local plumbing inspector that a low-profile trap is accepted in your specific application before installing one. In most residential shower installations they pass code, but commercial or multi-unit buildings may have stricter requirements.
Standard 2-Inch PVC P-Trap Models: Specs Comparison
The table below compares the most common 2-inch PVC P-trap models available in the US market, covering both standard and low-profile options with their key dimensions.
| Model / Manufacturer | Dimensions | Connection |
|---|---|---|
| Charlotte Pipe Standard (PVC00708P1000HD) | 3.188″ H x 7.594″ W x 9.125″ D | Hub x Hub (2″ x 2″) |
| IPEX Low-Profile (15 026432) | 7.7″ H x 2.7″ W x 9.3″ L | Hub x Hub (2″ x 2″) |
| Ferguson Low-Profile | Low-profile, 2″ fitting size | Hub x Hub (2″ x 2″) |
| Spears L.A. Pattern | G1: 3-5/8″ hub dimension | Hub x Hub (2″) |
| Standard Plumbing Schedule 40 | Standard Schedule 40, 2″ fitting | Hub x Hub (2″) |
| Code Standards Met | ASTM D 1784, D 2665, D 3311, NSF 14 | All listed models comply |
| Trap Arm Minimum (2″ pipe) | 4 inches straight run required | Sanitary tee connection |
Why Does P-Trap Size Matter For Drains?
The dimensions of a 2-inch PVC P-trap affect more than just fit — they determine whether the trap holds its water seal and prevents sewer gas from entering the building. The trap arm, which connects the P-trap to the vent stack, must have a minimum straight run of 4 inches for a 2-inch pipe. This is calculated as 2 times the pipe’s inner diameter per standard plumbing code requirements.
A shorter trap arm lets water flow siphon the trap dry, breaking the seal and allowing sewer gas into the structure. The connection to the vent must use a sanitary tee rather than a wye fitting, because a wye does not provide the proper flow dynamics to maintain the trap seal under load. PVC-U pipe also expands roughly 0.7 mm per meter for every 10°C temperature rise, so long horizontal runs in hot environments need room for thermal movement — though this is rarely a concern for the short sections inside a P-trap assembly itself.
Installation Tips For 2-Inch PVC P-Traps
Installing a 2-inch PVC P-trap follows the same basic sequence as smaller traps, but the larger diameter requires careful alignment and solid support to prevent sagging joints.
Remove the old trap from top to bottom by loosening the slip nuts with pliers. Place a bucket under the U-bend to catch standing water — the trap holds roughly a pint of water even after draining the fixture. Insert the new tailpiece washer so the beveled side faces the threaded portion of the pipe. For double-basin sinks, install a waste T-fitting to join the tailpieces, again with the beveled washer side facing the threaded pipe.
Connect the trap arm to the drain stub-out, making sure the beveled washer faces the threaded end. Attach the trap bend to the trap arm and tighten all slip nuts by hand, then a quarter turn with pliers. Never use Teflon tape on white plastic threads and fittings — it can cause the plastic to crack under compression or prevent the threads from