Pentair Small Body Flowmeter 3/4" Nylon Threaded End 2-16 GPM | LDF359N
Pentair
SKU: LDF359N
Pentair Letro Flowmeter, 2–16 GPM, 3/4" Nylon Threaded End (Small Body) | LDF359N
The Pentair LDF359N is a compact inline flow meter designed to measure water flow in the 2–16 GPM range. It features 3/4" nylon threaded ends for straightforward installation and an easy-to-read scale for quick verification of system flow. It’s commonly used where you need to confirm or dial in flow rate for pool/spa plumbing, water features, equipment pads, and general liquid flow applications.
Key Features
- Flow range: 2–16 gallons per minute (approx. 8–61 LPM).
- 3/4" nylon threaded ends for inline plumbing installation.
- Easy-to-read indicator for fast flow verification during setup and service.
- Compact “small body” design helps fit tighter equipment pads.
- Service-friendly design intended for straightforward installation and routine checks.
Common Uses
- Verifying system flow during equipment setup or troubleshooting
- Confirming flow rate for chemical feed systems and controllers (where a specific flow window is required)
- Checking booster/water feature flow to help fine-tune performance
- General water flow measurement in 3/4" threaded liquid lines
Specifications
- Brand: Pentair
- Part Number: LDF359N
- Catalog / Reference: 3280-139
- Flow Range: 2–16 GPM (approx. 8–61 LPM)
- Connection Size: 3/4" threaded (nylon ends)
- Body Style: Small body
- UPC: 788379505882
- Quantity: Sold individually
Selection Notes
- Choose a flow meter range where your normal operating flow sits in the middle of the scale when possible—this improves readability.
- Confirm your plumbing thread type and clearance before ordering (especially in tight equipment bays).
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Maintenance Tips
- Keep debris out of the line—restriction upstream can cause inaccurate readings and reduced performance.
- If readings become erratic, inspect for air in the line and confirm the meter is installed in the correct flow direction (if marked).
- Do not over-tighten plastic threaded ends; use a plastic-safe thread sealant and tighten snugly to prevent cracking.
- Winterize properly in freeze-prone areas to reduce risk of cracking from trapped water.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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