Complete Series
Complete Series: Small · Medium · Large
One material, three sizes – engineered for every water meter application from single homes to commercial pits.
Series Overview
The WINMETER water meter box series is manufactured from high‑strength composite resin – a premium material that combines the load capacity of cast iron, the corrosion resistance of stainless steel, and the lightweight convenience of engineering plastics. All three models (Small, Medium, Large) are designed for underground burial, outdoor exposure, and heavy traffic areas. They share the same key features:
Rustproof & UV‑stabilized – Service life >30 years.
Spring‑loaded latch with tamper‑resistant key – Prevents unauthorized opening.
Compatible with DN15 to DN40 meters – Choose the size that fits your meter.
Replacement parts available – Lids, keys, springs, pins, and bottom plates sold separately.
Material Advantages
| Property | Value |
|---|---|
| Tensile strength | ≥60 MPa |
| Flexural modulus | ≥3500 MPa |
| UV resistance | ASTM D4329 (2000h, no significant change) |
| Operating temperature | -30°C to +70°C |
| Water absorption | <0.5% (24h) |
| Flammability rating | V‑0 (self‑extinguishing) |
| Static load capacity | >15–25 metric tons (varies by model) |
Why composite over cast iron or plastic?
vs. Cast iron – 75% lighter, no rust, safer handling, lower shipping cost.
vs. PP/ABS – 5x stronger, UV‑resistant, no warping or chalking.
vs. Concrete – 1/4 the weight, no cracking, easy to cut/modify.
Detailed Specifications Comparison
| Model | Small | Medium | Large |
|---|---|---|---|
| Type | Tapered – wider bottom | Tapered – wider bottom | Tapered – wider bottom |
| Bottom L×W (mm) | 360×215 | 400×240 | 500×370 |
| Top L×W (mm) | 330×170 | 370×190 | 430×300 |
| H (mm) | 160 | 200 | 300 |
| Weight (kg) | 1.0 | 1.4 | 4.0 |
| Recommended meter size | DN15 – DN20 (½" – ¾") | DN20 – DN25 (¾" – 1") | DN25 – DN40 (1" – 1½") OR dual DN20 |
| Static load capacity | >15 metric tons | >18 metric tons | >25 metric tons |
| Ideal application | Single residential, rural well, garden tap | Standard home, small shop, campground | Multi‑family, farm, light commercial, municipal pit |
| Key feature | Ultra‑light, cheapest | Best balance of size & weight | Tapered design resists flotation; fits two meters |
Model‑by‑Model Deep Dive
WINMETER Small – The Economical Workhorse
Best for: Single‑family homes, rural water supply, garden irrigation, temporary construction points.
The Small model is the lightest in the series at just 1.0 kg. Its straight‑wall design means excavation is simple: dig a pit 380×230×180 mm, drop the box, and backfill. Despite its low weight, it handles foot traffic and occasional light vehicles. The spring latch and included key keep the lid secure.
Included in box:
Base + lid
Stainless steel spring latch with pin
One tamper‑resistant key
Paper installation guide
WINMETER Medium – The Versatile Performer
Best for: Standard homes, small retail shops, campground water points, meter + valve combinations.
The Medium offers a comfortable interior (400×240×200 mm) that fits a DN20–DN25 meter plus a pressure reducer or backflow preventer. At 1.4 kg, it is still very easy to handle. This is our most popular size for residential developments because it gives service crews enough room to work without taking up excessive yard space.
Why choose Medium over Small?
If your meter is DN20 (¾") and you have any additional fittings (valve, filter, check valve), the Medium's extra length makes maintenance much easier. For DN25 (1") meters, the Medium is the minimum recommended size.
WINMETER Large – The Heavy‑Duty Engineered Solution
Best for: Multi‑family units (duplex, triplex), small farms, light commercial sites, municipal meter pits, replacing concrete boxes.
The Large model is tapered – the bottom (500×370 mm) is significantly wider than the top (430×300 mm). This is not a cosmetic choice; it provides two engineering benefits:
Uplift / flotation resistance – The wider base acts like an anchor against groundwater pressure or frost heave.
Smaller surface footprint – You cut a smaller hole in pavement or lawn, and the tapered sides distribute vehicle loads more effectively.
The Large can house either a single DN25–DN40 meter with ample space for valves, or two DN20 meters side by side (common for duplex homes or shared irrigation lines). Weighing 4.0 kg, it is still much lighter than a concrete or cast iron pit of similar capacity.
Installation note for Large: Because of the taper, you must excavate a pit sized for the bottom dimensions (recommended 520×390×320 mm) and carefully compact soil under the bottom overhang. See our installation guide for details.
Common Features Across All Sizes
- Locking system – Every box comes with a unique triangular key. The spring‑loaded stainless steel latch ensures positive closure even after years of use. Replacement keys available in packs of 10 or 50.
- Corrosion resistance – Will not rust in saltwater, acidic soil, or fertilizer‑rich environments.
- UV protection – Carbon black and UV inhibitors prevent chalking and brittleness.
- Customization options – Custom colors (green, blue, gray) on MOQ 500 pcs. Custom logo molding on lid for large contracts. Pre‑drilled knockouts for conduits available.
- Parts availability – Lids, keys, spring pins, and bottom plates can be ordered individually – a critical advantage for utility maintenance fleets.
Installation Guidelines (General)
| Step | Small / Medium (Straight Wall) | Large (Tapered) |
|---|---|---|
| 1. Excavation pit size | L+20, W+20, H+20 mm (e.g., 380×230×180 for Small) | Bottom dimensions +20 mm each side, +20 mm depth (e.g., 520×390×320) |
| 2. Gravel base | 50–70 mm compacted gravel | 70–100 mm compacted gravel |
| 3. Box placement | Lower straight down | Lower straight down – wider bottom will be below narrower top |
| 4. Backfill | Compact evenly around sides | First compact under the bottom overhang, then layer by layer |
| 5. Final grade | Lid flush with finished ground | Lid flush with finished ground |
Always: Ensure the lid is exactly level with the surrounding surface to prevent tripping hazards and vehicle damage.
Frequently Asked Questions
Q1: Can the Small box handle a car driving over it?
A: Yes, the Small has a static load rating >15 metric tons, which is sufficient for passenger cars and light trucks. For regular heavy truck traffic, choose the Large.
Q2: Are the keys the same for all three sizes?
A: Yes, all WINMETER boxes use the same key. You can order extra keys separately.
Q3: Do you provide installation drawings (CAD)?
A: Yes, we provide 2D CAD drawings (DWG/PDF) for each model upon request.
Q4: What is the lead time for bulk orders?
A: 20–25 days after deposit for quantities 100–500 pieces. Samples: 5–7 days.
Q5: Can I get a sample before ordering bulk?
A: Yes. Sample orders have no MOQ. The sample cost is refundable against a future bulk order.
Q6: How do I know which size to buy?
A: Measure your water meter's connection size (DN). DN15–20 → Small; DN20–25 → Medium; DN25–40 or dual meters → Large. Also consider if you need extra space for valves.
Contact Us
For bulk pricing, custom molding, technical drawings, or sample orders, please contact our sales team.
WINMETER – Smart Solutions for Water Infrastructure
High‑strength composite water meter boxes – built to last underground, designed for easy access.
Water meter box, water meter enclosure, water meter chamber, and water meter protection box are very important products in modern water supply system. Especially for underground water meter box and outdoor installation, the protection performance is very critical, sometimes it will affect the service life very much.
Our company provide different types of water meter box, including plastic water meter box, composite water meter box, fiberglass water meter box, HDPE water meter box, SMC water meter box, and polymer concrete water meter box. Also we can supply cast iron water meter box and stainless steel water meter box for heavy duty environment, which is very strong and durable, many customers like it very much.
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