201 Stainless Steel Pipe Fittings — Female Socket Coupler Adapters (1/2", 3/4", 1")

Measure the outer diameter (OD) of your existing pipe and match it to the nominal pipe size. For example, a 1/2" nominal pipe typically has an OD of about 0.840" (21.3 mm), a 3/4" nominal pipe is about 1.050" (26.7 mm), and a 1" nominal pipe is about 1.315" (33.4 mm). When in doubt, measure the pipe OD and consult a nominal pipe size (NPS) chart. Do not measure the inner diameter — nominal pipe sizes are based on OD conventions, not actual inner dimensions.

The Hex socket style has a six-sided outer body, which allows you to grip and tighten the fitting with a standard pipe wrench or adjustable wrench for a controlled, torque-applied connection. The Round socket style has a smooth cylindrical body, generally used where wrench access is limited or where a cleaner visual profile is preferred. Both styles function as female socket couplers — the difference is in the outer geometry and installation method.

201 stainless steel generally offers good corrosion resistance for indoor plumbing, irrigation systems, and light outdoor applications in non-corrosive environments. It is not typically recommended for saltwater exposure, coastal environments, or direct contact with harsh chemicals. For those conditions, 304 or 316 stainless steel is generally a better choice. If you are unsure whether 201 SS is appropriate for your environment, contact us to confirm before ordering.

These fittings are designed for standard NPT (National Pipe Taper) or BSP (British Standard Pipe) threaded connections — the two most common pipe thread standards used in US and international plumbing systems. NPT and BSP threads are not interchangeable, so confirm which standard your existing pipe system uses before ordering. If you are unsure, contact us with your pipe specifications and we can help confirm compatibility.

201 stainless steel pipe fittings are typically suitable for moderate-pressure applications in residential and light commercial plumbing. Actual pressure ratings depend on the nominal pipe size, wall thickness, thread engagement, and installation method. For pressure-critical systems — such as compressed air lines or high-pressure fluid transfer — contact us to confirm the specific rating for your chosen size and configuration before installation.

Use the Reducer fitting (1" to 3/4") when you need to connect a 1" pipe to a 3/4" pipe in the same run — for example, when transitioning from a main supply line to a branch line, or when adapting an existing 1" system to accept 3/4" fixtures. It eliminates the need for a separate bushing or step-down adapter, simplifying the connection and reducing potential leak points.

Each listing is available in 1-piece, 3-piece, and 5-piece packs. For a single repair or connection point, the 1-piece pack is sufficient. For projects with multiple connection points — such as an irrigation manifold, a multi-branch plumbing run, or a framework build — the 3-piece or 5-piece packs offer a lower per-unit cost. Select your preferred quantity from the Packing Qty option above.