Flojet 01825004C Adapter, 1/2" Slip Stem x 1/2" Male NPT
The Flojet 01825004C is a genuine adapter joining a 1/2" slip stem to a 1/2" male NPT thread. It is the standard transition from a quick-connect tubing system to threaded hardware at the main supply size.
Half-inch male NPT is probably the most common port thread in the whole of marine and mobile water plumbing. Pumps, tank fittings, filter housings, accumulators, water heaters, shut-off valves and manifolds are all routinely tapped for it, which makes this the adapter that turns a quick-connect system from something that works between its own fittings into something that connects to everything else on the vessel.
The usual NPT caution applies. It is a tapered thread that seals on the flanks, so it needs sealant and a firm hand rather than force — and because the female half takes the splitting load, a plastic-into-metal joint this way round is the more forgiving arrangement. Fit the threaded end first, before the tube is attached, so nothing is being twisted as you tighten. Then push the squarely cut tube fully home and confirm it has locked.
Key Features
- Genuine Flojet (Xylem) plumbing fitting — part of the quick-connect system
- 1/2" slip stem to 1/2" male NPT — the most common port thread in the system
- Connects quick-connect tubing to pumps, tanks, heaters, filters and valves
- Male thread form tolerates installation torque better than a female plastic thread
- Hand assembly on the stem side, standard threaded joint on the other
Applications
- Fresh water systems plumbed in 1/2" quick-connect tubing
- Connecting to pump inlet and outlet ports
- Tank fittings, accumulators and water heater connections
- Filter housings, shut-off valves and manifolds
- Marine, RV and mobile potable water systems
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 01825004C
- Part Type: Transition adapter fitting
- Connections: 1/2" slip stem x 1/2" NPT male
- Condition: New
Frequently Asked Questions
Q: Can I tell NPT from BSP by eye?
Not reliably. The thread angles differ by a few degrees and BSP parallel threads have flat crests, but the safest check is the component’s own documentation rather than a visual comparison.
Q: How many turns past hand tight is right?
Roughly one to two with a spanner for a joint this size, and stop the moment it feels firm. With a tapered thread, the last quarter turn adds far more stress than seal.
Q: Is thread sealant needed on both halves?
Only on the male thread. Applying it inside the female as well just squeezes excess into the waterway.
Q: What if the joint still weeps after resealing twice?
Inspect the first two or three threads carefully. A cross-start or a flattened crest will not seal however much tape goes on, and at that point the fitting needs replacing rather than retrying.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct part before you order.
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