Flojet 01825001C Adapter, 1/2" Slip Stem x 3/4" Hose Barb
The Flojet 01825001C is a genuine adapter joining a 1/2" slip stem to a 3/4" hose barb. It steps a quick-connect tubing system up to the larger hose size in a single fitting.
The step up to 3/4" is almost always made on the suction side, and for a good reason. A pump’s inlet is where restriction hurts most: it has no pressure to push water through a tight line, only atmospheric pressure and whatever head the tank provides. Going up a hose size on the inlet reduces the velocity and the friction loss in that run, which improves priming, reduces the chance of cavitation, and lets the pump deliver what it was rated to deliver rather than what the plumbing allows.
On the stem side the fitting pushes into its matching socket and seals on an O-ring. On the barb side, warm the hose before fitting it — 3/4" hose is stiff, and forcing it cold either leaves it short of fully seated or damages the inner wall — then secure it with a clamp behind the last ridge. Keep clamps off the stem and socket, where a distorted bore means a leaking O-ring.
Key Features
- Genuine Flojet (Xylem) plumbing fitting — part of the quick-connect system
- 1/2" slip stem to 3/4" hose barb in one fitting
- Steps up to the larger hose size where inlet restriction matters most
- Reduces friction loss on the suction side, improving priming
- Hand assembly on the stem side — only the hose clamp needs a tool
Applications
- Upsizing a pump suction line to 3/4" hose
- Mixed systems combining quick-connect tubing with larger barbed hose
- Tank pickup and transfer plumbing
- Improving priming on a system that has been slow to lift
- Marine, RV and mobile potable water systems
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 01825001C
- Part Type: Transition adapter fitting
- Connections: 1/2" slip stem x 3/4" hose barb
- Condition: New
Frequently Asked Questions
Q: Is a larger suction hose always better?
Up to a point. Going one size up on the inlet is usually worthwhile; going much further mostly adds bulk and standing water without measurable gain, because the restriction has stopped being the limiting factor.
Q: Does the fitting itself become the restriction?
Briefly, and that is unavoidable at any transition. What matters is that the narrow section is short — friction loss depends on length as well as bore, so a short reduction costs far less than a long one.
Q: Why is the suction side more sensitive than the discharge?
Because the pump can only pull with the pressure available to it, which is roughly atmospheric. On the discharge side it can push with whatever pressure it generates, so restriction there costs flow rather than prime.
Q: Should I use reinforced hose on the inlet?
Yes. Suction hose sees negative pressure and unreinforced hose can collapse under it, which produces exactly the restriction you fitted the larger size to avoid.
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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