KUS S5U-9 Water Level Sensor – 1.5" NPT (9" Probe)
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KUS S5U-9 Water Level Sensor – 1.5" NPT (9" Probe) is a 9 in. probe, 1.5 in. NPT liquid-level sender for water, fuel, or diesel tanks. It outputs the American Standard 240-33Ω curve, which is what most US-market water and fuel gauges read, so it pairs with any 240-33Ω gauge without a signal converter. Typically ships in 5-7 business days.
It threads into any 1.5 in. NPT tank port; use a thread sealant rated for what is in the tank, then turn it until the leads point toward your wire run before snugging down — do not overtighten. Leave at least 1 in. between the tank bottom and the float collar (0.5 in. on stainless or aluminum tanks), and measure from the inside bottom of the tank to the top of the port before picking a probe length. Wiring is two-wire only, with no power feed needed: pink to ground, black to the sender terminal on your gauge.
Inside, a magnetic float slides along a chain of reed switches, so the float is the only moving part — there is no wiper arm to wear out or corrode. You'll need a gauge on the 240-33Ω curve to read it; most van builds do not have one until it's added, so confirm what your panel reads before ordering.
Key Features: KUS S5U-9 Water Level Sensor – 1.5" NPT (9" Probe)
Built for accurate, corrosion-resistant tank monitoring.
- 316 stainless steel body with an NBR float — both corrosion resistant, rated for water, gasoline, diesel, and hydraulic oil.
- Reed switch sensing with a magnetic float gives 21 mm resolution and no wiper-arm wear.
- Outputs the American Standard 240Ω (empty) to 33Ω (full) curve, so it reads on most existing US water/fuel gauges without a converter.
- IP65-sealed housing for wet-mount reliability.
- PVC-jacketed leads (pink = ground, black = signal) for a simple two-wire hookup with no power feed.
- Rated for 12V or 24V systems at 125 mW.
- Genuine KUS Americas part.
What's Included?
- (1) KUS S5U-9 Water Level Sensor – 1.5" NPT (9" Probe) sending unit
Compatible Tanks
Works with any tank that has a 1.5 in. NPT sender port and a gauge on the American Standard 240-33Ω curve, OEM or aftermarket. Confirmed compatible NW Conversions/GoCode tanks:
| KUS P/N | Tanks (Alt SKU / Master SKU) |
| S5U-15 | SP-R-22 (NWU0255), SP-C-20 (NWU0251), SP-L-20 (NWU0247), SP-R-20 (NWU0245), SP-C-36 (NWU0240), SP-C-24 (NWU0238), TR-L-24 (NWT0252), TR-C-24 (NWT0249), TR-R-24 (NWT0248) |
| S5U-8 | TR-UC-20 (NWT0281), TR-UC-16 (NWT0282), SP-UC-22 G (NWS0257), SP-UC-11 G (NWS0256) |
| S5U-19 | SP-DU-19 (NWU0279), SP-DU-25 (NWU0280), SP-L-33 (NWU0244), SP-R-33 (NWU0242), PM-R-28 (NWP0262), PM-L-28 (NWP0261), PM-C-28 (NWP0246) |
| S5U-9 | TR-ST-24 (NWT0285), SP-ST-28 (NWS0236) |
| S5U-6 | TOY-11 (NWX0260) |
| S5U-17 | NWU0258, NWU0259 |
Specifications: KUS S5U-9 Water Level Sensor – 1.5" NPT (9" Probe)
| Probe Length | 9 in. |
| Mounting | 1.5 in. NPT male thread, hex head |
| Output Curve | American Standard, 240Ω empty to 33Ω full |
| Sensing Method | Reed switch chain with magnetic float |
| Resolution | 21 mm |
| Body Material | SUS 316 stainless steel |
| Float Material | NBR |
| Leads | PVC jacketed — pink (ground), black (signal) |
| Protection Rating | IP65 |
| Operating Temperature | -40°F to +185°F |
| Power | 12V or 24V systems, 125 mW |
| Manufacturer Part Number | KUS 154009 |
