Flojet 01825005C Adapter, 1/2" Slip Stem x 3/4" Male NPT
The Flojet 01825005C is a genuine adapter joining a 1/2" slip stem to a 3/4" male NPT thread. It connects a 1/2" quick-connect tubing system to the larger threaded ports found on tanks, heaters, strainers and the bigger pumps.
Three-quarter inch NPT turns up wherever a component needs to pass more flow than a half-inch port allows, or simply where a manufacturer has standardised on the larger size for strength. Tank fittings are a common example: a bulkhead fitting through a tank wall benefits from the larger thread’s greater engagement area, whether or not the flow requires it. Having the right adapter means you connect to that port properly rather than stacking a reducing bush on top of a half-inch fitting.
Avoiding that stack is the real point. Every additional threaded joint is another sealed interface to make correctly and another place to inspect, and a reducer sitting between two fittings is the one you cannot see once everything is assembled. Fit the threaded end first with sealant, firm rather than hard, 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 3/4" male NPT in one fitting
- Connects directly to larger tank, heater and strainer ports
- Removes the reducing bush and the extra joint it brings
- Hand assembly on the stem side, standard threaded joint on the other
Applications
- Connecting 1/2" tubing to 3/4" NPT tank and bulkhead fittings
- Water heater and accumulator connections
- Larger strainer, filter and valve ports
- Refits replacing a stacked reducer and adapter with one fitting
- Marine, RV and mobile potable water systems
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 01825005C
- Part Type: Transition adapter fitting
- Connections: 1/2" slip stem x 3/4" NPT male
- Condition: New
Frequently Asked Questions
Q: Does connecting 1/2 in. tubing to a 3/4 in. port waste the larger port?
On the discharge side it costs very little, because the reduction is short. On a pump suction it is worth avoiding where you can, since that is where restriction genuinely limits performance.
Q: Why do tanks use larger threads than the flow needs?
Mostly for mechanical strength. A larger thread has more engagement in a moulded tank wall and is far less likely to strip or crack around the boss.
Q: Is a single adapter really better than a bush and a fitting?
Yes, on two counts: one seal instead of two, and a shorter assembly that puts less leverage on the tank boss if anything knocks the plumbing.
Q: Can I use PTFE tape on a large plastic thread?
Yes, and use a few more wraps than you would on a small one — the thread is longer and there is more flank area to fill. Keep it clear of the leading thread.
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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