Plastic Fittings
PVC vs. CPVC vs. ABS Fittings
| Material | Common Appearance | Common Applications | Common Connection Methods |
|---|---|---|---|
| PVC | Commonly white or gray | Cold-water piping, irrigation, drainage, and other approved applications | Solvent Cement, Threaded |
| CPVC | Commonly cream, tan, or gray depending on the system | Hot- and cold-water distribution and other approved pressure applications | Solvent Cement, Threaded |
| ABS | Commonly black | Drain, waste, and vent (DWV) systems | Solvent Cement |
Note: Color alone should not be used to identify plastic piping or fittings. Applications, pressure ratings, temperature limits, and connection requirements vary by product and manufacturer. Always verify product specifications and local code requirements before installation.
Plastic Piping System & Size Terms
| Term | Commonly Used With | What It Means |
|---|---|---|
| IPS | PVC, Schedule 40 / 80 plastic piping, and other compatible systems | Iron Pipe Size; a nominal sizing system commonly used for plastic pipe and fittings |
| CTS | CPVC CTS and other compatible systems | Copper Tube Size; dimensions based on copper tube sizing conventions |
| DWV | PVC and ABS drainage systems | Drain, Waste & Vent; identifies piping and fittings intended for non-pressure drainage and vent applications |
| Schedule 40 | PVC and other schedule-rated piping systems | A common pipe wall-thickness designation |
| Schedule 80 | PVC, CPVC, and other schedule-rated piping systems | A heavier-wall schedule than Schedule 40 for the same nominal pipe size |
Note: The same nominal size does not always mean two products are compatible. Always confirm the material, sizing system, schedule, connection type, and product specifications before selecting fittings.
Common Plastic Fitting Connection Types
| Connection Type | How It Connects | Common Uses |
|---|---|---|
| Socket / Slip | Pipe inserts into the fitting socket | Common in PVC and CPVC solvent-weld piping systems |
| Hub | Pipe or a compatible spigot end inserts into the fitting opening | Common in PVC and ABS DWV fittings |
| Spigot | Fitting end has pipe-like outside dimensions and inserts into a compatible hub or socket | Compact transitions and specialty fittings |
| Female Threaded | Accepts a compatible male threaded connection | Transitions, valves, equipment, and fixture connections |
| Male Threaded | Threads into a compatible female threaded connection | Transitions, valves, equipment, and fixture connections |
| Union | Joins two piping sections while allowing easier future disconnection | Serviceable piping connections |
| Adapter | Transitions between connection types, materials, or fitting configurations | System transitions and equipment connections |
Note: Connection styles are not automatically interchangeable. Verify fitting material, nominal size, socket or thread type, and manufacturer compatibility before installation.
PVC couplings are used to join sections of PVC pipe in a straight line for extensions, repairs, and other plumbing connections. This guide explains common PVC fittings and coupler types—including slip couplings, threaded PVC couplings, compression fittings, and transition couplings—and how to choose the right option based on PVC pipe size and application. It also covers connections to other materials using a PVC to PEX adapter, along with the differences between PVC and CPVC pipe fittings.
Connecting PVC pipes of different diameters requires the right reducing fitting to maintain a secure, leak-resistant connection and proper water flow. This guide covers different types of PVC pipe fittings used for changing pipe size, including reducing PVC couplings, threaded reducing fittings, bushings, and compression fittings. It also explains when PVC glue is required and how pipe size and connection type affect the installation of PVC pipes and fittings in a plumbing system.
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