✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Description
Genuine OEM Replacement Nuts for Older LMI Liquipro Chemical Metering Pumps
LMI Liquipro Coupling Nuts are genuine OEM replacement fittings for most older LMI Liquipro series pumps and accessories, including foot valves, injection valves, suction valves, and discharge valves. Two sizes cover the full Liquipro tubing range:
- Size 1: fits both 1/4" and 3/8" tubing connections
- Size 2: fits 1/2" tubing connections
When tightened correctly, the coupling nut compresses a ferrule or clamp ring onto the tubing to form a leak-resistant seal, a critical part of any chemical metering pump's day-to-day reliability.
Important: Ferrules & Clamp Rings Sold Separately
Coupling nuts work in tandem with either a plastic ferrule or a stainless steel clamp ring, depending on tubing size and valve type. Use the matrix below to select the right combination:
| Tubing Size | Valve Type | What You Also Need |
|---|---|---|
| 1/4" tubing | Any valve | Plastic ferrule |
| 3/8" tubing | Foot valve | Plastic ferrule (NOT clamp ring) |
| 3/8" tubing | Injection, suction, or discharge valve | Stainless steel clamp ring |
| 1/2" tubing | Injection, suction, or discharge valve | Stainless steel clamp ring |
Per LMI installation guidance: ferrules and clamp rings should NEVER be reused. Always install a new ferrule or clamp ring whenever you remake a tubing connection. Reusing the original part is a common cause of leaks.
LMI Liquipro Coupling Nuts Key Features
- Genuine OEM replacement: Direct fit on older LMI Liquipro series pumps and accessories
- Two sizes cover three tubing dimensions: one nut size fits both 1/4" and 3/8" tubing; a second size fits 1/2" tubing
- Universal valve compatibility: works with foot valves, injection valves, suction valves, and discharge valves
- Chemical-resistant material: PVDF construction for compatibility with the broad range of chemicals used in metering pump applications (verify against your specific chemistry before ordering)
- Leak-resistant seal: compresses ferrule or clamp ring onto tubing when properly tightened
Installation Notes
To get a reliable seal and avoid common installation errors, follow LMI's published guidance:
- Hand-tighten only, then add 1/8 to 1/4 turn after the fitting contacts the seal. Do not overtighten. This is the leading cause of nut and ferrule damage.
- Use a new ferrule or clamp ring every time. Reused ferrules cause leaks.
- Do not use PTFE tape or pipe dope on coupling-nut threads. These threads are designed for a mechanical seal.
- Slide the coupling nut onto the tubing first, then the ferrule or clamp ring, before connecting to the valve.
When to Replace a Coupling Nut
Coupling nuts wear out over time. The two most common causes are repeated overtightening (which deforms the threads) and chemical attack (which can degrade the polymer over years of exposure to aggressive solutions like sodium hypochlorite or sulfuric acid).
Replace the coupling nut when you see:
- Visible cracking or distortion of the nut body
- Threads that no longer hold the connection at the recommended tightness
- Repeat leaks at the same connection, even with a new ferrule
- Chemical staining or chalking on the nut surface (sign of prolonged chemical exposure)
Common Applications
LMI Liquipro coupling nuts are used in chemical feed systems across:
- Municipal water treatment
- Wastewater treatment facilities
- Cooling tower chemical treatment
- Boiler water treatment
- Industrial chemical feed and dosing
- Disinfection systems (sodium hypochlorite, chlorine dioxide)
- Skid-mounted chemical dosing packages
Buy LMI Liquipro Coupling Nuts Online from Cleanflow
Order LMI Liquipro Coupling Nuts from Cleanflow for dependable tubing connection maintenance in chemical metering systems. Choose the correct fitting size for your Liquipro pump setup and maintain secure, leak-resistant tubing connections for foot valves, injection valves, and chemical dosing applications.
Buy LMI Liquipro Coupling Nuts and maintain secure, leak-resistant chemical tubing connections with genuine OEM replacement coupling nuts from Cleanflow.
For more LMI metering pump products and repair components:
Frequently Asked Questions
How many coupling nut sizes are there?
Two. One nut size fits both 1/4" and 3/8" tubing; a second size fits 1/2" tubing.
Do I need a ferrule or a clamp ring with my coupling nut?
It depends on the tubing size and the valve. For 1/4" tubing, use a plastic ferrule. For 3/8" tubing on a foot valve, use a plastic ferrule. For 3/8" or 1/2" tubing on an injection, suction, or discharge valve, use a stainless steel clamp ring. Both are sold separately.
Are these compatible with my older LMI Liquipro pump?
These coupling nuts fit most older LMI Liquipro series pumps and accessories. If you're not sure whether your specific pump model is compatible, contact our team with your pump's part number, and we'll confirm before you order.
Can I reuse my old ferrule or clamp ring with a new coupling nut?
No. Per LMI installation guidance, ferrules and clamp rings should not be reused. Always install a new one whenever you remake a tubing connection. Reusing the original is a common cause of leaks.
How tight should I make the coupling nut?
Hand-tight, then an additional 1/8 to 1/4 turn after the fitting contacts the seal. Do not use a wrench to overtighten. This is the leading cause of damage to both the nut and the ferrule.
What systems use LMI Liquipro coupling nuts?
Chemical metering pump fittings like these are used in water and wastewater treatment, cooling tower treatment, boiler treatment, disinfection, and industrial chemical dosing systems.
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
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