Wacker Neuson 5000155395 1/4 NPT x 1/2 NPT Fitting
Wacker Neuson

Wacker Neuson 5000155395 1/4 NPT x 1/2 NPT Fitting

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5000155395-Wacker Neuson
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The Wacker Neuson is a genuine OEM 1/4 NPT x 1/2 NPT Fitting designed for G25 series portable generators and LTW series light towers. As a direct factory replacement, this fitting threads in exactly as the original, maintaining a leak-free fluid or fuel line connection with no guesswork on sizing or thread pattern. It is verified for a broad range of G25 generator configurations — including standard, cold weather, custom, extended run, and Tier 4 variants — as well as LTW6K, LTW8K, LTW20Z-1, and LTW20Z-3 light tower models. Sourcing a genuine Wacker Neuson part like the ensures the connection point meets the same specifications as the original build.

Key Features

  • Genuine OEM Thread Integrity — Manufactured to the exact NPT thread specification of the original fitting, eliminating the risk of cross-threading or sealing failures common with mismatched hardware.
  • Dual-Size NPT Configuration — The 1/4 NPT to 1/2 NPT step-up profile matches the original plumbing layout, allowing direct installation into the existing port without adapters or intermediate fittings.
  • Broad G25 Generator Compatibility — Fits the full G25 family across standard, cold weather, custom, extended run, and T4/T4i/T4F emission-tier variants.
  • LTW Light Tower Coverage — Also verified for LTW6K, LTW8K, LTW20Z-1, and LTW20Z-3 light towers in standard, cold weather, and custom configurations.
  • Leak-Free Line Integrity — A correctly seated NPT fitting maintains consistent fluid pressure across the plumbing circuit; a failed or worn fitting can cause fluid loss, pressure drop, and potential engine or system shutdown.
  • Fuel and Fluid System Safety — Fittings in fuel or fluid lines that are cracked, stripped, or improperly sized create leak points; using the correct OEM part keeps the connection within the machine's original design envelope.

An NPT fitting serves as a threaded connection point within a machine's fluid or fuel plumbing system, joining lines of different pipe sizes in a pressure-tight seal. The tapered thread profile of the NPT standard creates a mechanical seal as the fitting is tightened, with the 1/4 NPT inlet and 1/2 NPT outlet of this fitting allowing two differently sized lines or ports to be joined without leakage. When a fitting becomes cracked, corroded, or stripped, it can no longer maintain that seal — leading to fluid loss, contaminated connections, or system pressure failure that takes the generator or light tower out of service.

Part Details

Part Number5000155395
Old Part Number0155395
BrandWacker Neuson
Part TypeGenuine OEM
Description1/4 NPT x 1/2 NPT Fitting

Compatibility & Fitment

Name Model Machine Number
Mobile Generator, Custom G25 5000620346, 5000620344, 5000620345, 5000620642, 5000009466, 5000620004, 5000620640, 5000620709, 5000620641, 5000009368, 5200005557, 5200003991, 5000620931, 5200001316, 5200009372, 5200009376, 5200009370, 5200009371, 5200009373, 5200009377, 5200014461, 5000009258, 5200009375, 5200009374, 5200014460, 5200014462, 5000621005, 5100041584, 5200022587, 5100045084, 5100041580, 5100041592, 5000620706, 5100017591, 5100022834, 5100041581, 5100041582, 5100041583, 5100045541, 5100045542, 5100050326, 5000009462, 5000009476, 5100042507, 5100042510, 5100042512, 5100042509, 5100025836, 5100042508
LTW20Z-1, LIGHT TOWER 60Hz, ISUZU, CUSTOM, T4i LTW20Z1 5000620842, 5000620375, 5200004205, 5200004096, 5100051572, 5100051571, 5200014324, 5200014326, 5200018239, 5200023191, 5200024872, 5200014328
LTW6K Light Tower, Standard T4 LTW6K 5000620372, 5000620840, 5200004094, 5200024870
LTW8K Light Tower, Standard T4 LTW8K 5000620374, 5000620841, 5200004204, 5200004095, 5200023190, 5200024871
LTW20Z-3, LIGHT TOWER 60HZ, ISUZU TIER 4i LTW20Z3 5000620376, 5000620843, 5200003583, 5200004097, 5200014325, 5200014327, 5200023192, 5200023604, 5200014329
LTW20Z3-V S LIGHT TOWER, COLD WEATHER, T4i LTW20Z3-V S 5200018566, 5200018558, 5200018562, 5200023196, 5100015094, 5100022126
LTW20Z1-V S LIGHT TOWER, COLD WEATHER, T4i LTW20Z1-V S 5200018565, 5200018557, 5200018561, 5200024875, 5200023195, 5100015093, 5100022125
LTW6K-V S Light Tower, Cold Weather T4 LTW6K-V S 5200018563, 5200018555, 5200018559, 5200024873
LTW8K-V S Light Tower, Cold Weather T4 LTW8K-V S 5200018564, 5200018556, 5200023194, 5200018560, 5200024874, 5100015095, 5100022084
Light Tower LTW20Z3-V 5200012881, 5200012885, 5200012867, 5200022694
Light Tower LTW6K-V 5200012864, 5200012868, 5200012882
Light Tower LTW8K-V 5200012869, 5200012883, 5200012865
Light Tower LTW20Z1-V 5200012880, 5200012884, 5200012866
Mobile Generator G20 5200016628, 5200022625

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.