Zoeller In-Line Check Valves

Zoeller In-Line Check Valves: Built by Pump Experts, Engineered for Reliability

When it comes to protecting a sump or drain pump system from damaging backflow, the check valve in the discharge line is one of the most critical components in the entire setup — and few names carry more authority in that space than Zoeller. In-line check valves from Zoeller are purpose-built accessories that pair directly with the brand's own pumps, benefiting from decades of application engineering that most valve manufacturers simply don't have.

Zoeller Pump Company has been designing water-management solutions since its founding in 1939, and that depth of experience shows in its check valve lineup. Every valve is designed to work in concert with sump, drain, and effluent pump systems, addressing the real-world constraints — tight basement clearances, varying pipe orientations, and the need for straightforward serviceability — that installers and homeowners encounter most.

What Sets Zoeller In-Line Check Valves Apart

Zoeller's in-line check valve range covers several distinct designs, each targeting a specific installation scenario or performance need:

• Standard Inline Check Valve: Designed for basement sump or drain pump applications to prevent backflow, this valve installs in either a vertical or horizontal orientation in the discharge line, offering genuine flexibility for space-constrained basements.
• Quiet Check Valve: The Quiet Check Valve line features solvent-weld slip connections on either end for easy splicing into an existing discharge line, and includes unions on either end to simplify pump removal without cutting the discharge pipe — a detail that makes routine maintenance significantly less disruptive.
• Combo Check Valve: Engineered for effluent and sump pump applications, this model incorporates a neoprene gasket and flapper weighted with stainless steel backing plates and a stainless steel rivet, plus all-stainless steel screws for long-term hardware durability. A threaded union allows pump removal without disturbing the discharge piping.
• Clear Quiet Check Valve: A transparent PVC version of the Quiet Check Valve that allows visual inspection of the valve's internal operation — a valuable troubleshooting feature for diagnosing intermittent backflow issues.

Across the lineup, Zoeller offers check valves in both brass and PVC construction. Brass spring-loaded check valves are engineered to screw directly into the pump discharge, making them a natural choice when the goal is a compact, pump-integrated solution. PVC variants prioritize corrosion resistance and are well-suited to chemical-laden effluent environments.

Installation Flexibility and Warranty Confidence

One of the practical advantages of Zoeller's in-line check valve family is its installation versatility. Whether the discharge line runs vertically up through a floor joist or exits horizontally through a foundation wall, these valves accommodate both orientations without requiring separate part numbers. That kind of flexibility reduces the guesswork during installation and ensures a proper fit in a wide range of residential and light-commercial setups.

Each valve in this line is backed by a 1-year limited warranty from Zoeller Pump Company, consistent with the brand's broader commitment to quality and customer confidence. As one of the oldest family-owned submersible pump manufacturers in North America — now in its fourth generation of family leadership — Zoeller brings an institutional focus on quality that extends from its pumps all the way to the accessories that keep those pumps running correctly.

Whether you're replacing an aging valve on an existing system or specifying components for a new installation, browse the full selection of Zoeller in-line check valves to find the right fit, or explore the complete Zoeller brand catalog for compatible pumps and controls.