The Wacker Neuson Check Valve 1/2 NPT Female 5 PSI is a genuine OEM component designed for the E1250S Hydronic Heater and HSH380S heater series, including LP/NG, diesel, and generator-equipped configurations. As a direct OEM part, the is manufactured to Wacker Neuson's exact specifications, ensuring correct cracking pressure, thread dimensions, and material compatibility right out of the box. This valve fits across multiple E1250S and HSH380S variants, making it a reliable choice whether you're servicing a standard propane unit or a diesel-powered HSH380S with an onboard generator. Confirm your model number against the fitment list before ordering to ensure an accurate match.
Key Features
- Correct Cracking Pressure Rating — Engineered to open at precisely 5 PSI, maintaining the calibrated flow control your heater's hydronic or fuel circuit depends on.
- Standard 1/2 NPT Female Threading — Threads directly into existing 1/2 NPT male ports with no adapters needed, simplifying installation in the field.
- Genuine Wacker Neuson OEM Part — Sourced directly from Wacker Neuson, this part meets the same material and dimensional standards as the original component it replaces.
- Broad Fitment Across E1250S and HSH380S Variants — Compatible with standard, LP/NG, diesel, and generator-equipped models in both the E1250S and HSH380S heater lines.
- Fuel and Fluid System Safety — A correctly functioning check valve prevents backflow in pressurized fuel and hydronic circuits; a failed or stuck valve can cause pressure loss, backflow contamination, or unsafe system conditions.
A check valve is a one-directional flow control component that allows fluid or gas to pass through in only one direction, automatically closing to block reverse flow when pressure drops. In hydronic heaters and fuel-delivery circuits like those found in the E1250S and HSH380S, it protects system integrity by preventing backflow that could disrupt combustion, damage pumps, or create unsafe pressure fluctuations. When a check valve wears out or sticks open, the system loses the ability to maintain consistent pressure, which can result in poor heater performance, hard starts, or potential fuel system hazards.
Part Details
| Part Number | 5100051711 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Check Valve 1/2 NPT Female 5 PSI |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| E1250S | E1250S | 5200012355, 5200012354 |
| HSH380s | HSH 380S | 5100054643 |
| HSH380S-Diesel, with Generator | HSH380S | 5200012371, 5200012370 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
