---
product_id: 412023363
title: "WS400125P"
brand: "merrill"
price: "£55.86"
currency: GBP
in_stock: true
reviews_count: 8
category: "Merrill"
url: https://www.desertcart.co.uk/products/412023363-ws400125p
store_origin: GB
region: United Kingdom
---

# 1-1/4" drop pipe size secure retaining nuts 4" well casing fit WS400125P

**Brand:** merrill
**Price:** £55.86
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal your well, secure your flow – the pro’s choice for flawless water systems!

## Quick Answers

- **What is this?** WS400125P by merrill
- **How much does it cost?** £55.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/412023363-ws400125p)

## Best For

- merrill enthusiasts

## Why This Product

- Trusted merrill brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Fit for 4" Well Casings:** Engineered to snugly seal standard 4-inch inside diameter well casings, ensuring leak-proof performance.
- • **Heavy-Duty Molded PVC Construction:** Durable ABS plastic combined with zinc-plated steel for long-lasting corrosion resistance and strength.
- • **Optimized 1-1/4" Drop Pipe Compatibility:** Designed specifically for 1-1/4 inch drop pipes, perfect for submersible or jet pump setups.
- • **User-Friendly Installation & Maintenance:** Retaining nuts enable quick, secure installation and effortless removal, saving you time on site.
- • **Trusted Industry Choice with Proven Quality:** Backed by a 4.4-star rating and top 60 ranking in water pump accessories, join thousands who rely on Merrill.

## Overview

The Merrill MFG 4" Well Seal Cap with Single Top Plate is a heavy-duty, precision-engineered solution for sealing 4-inch well casings. Featuring a 1-1/4" drop pipe size, molded ABS plastic construction, and zinc-plated steel components, it ensures durability and corrosion resistance. Its retaining nuts provide secure, easy installation and removal, making it ideal for submersible or jet pump applications. Highly rated and trusted by professionals, this well seal cap delivers reliable performance and peace of mind.

## Description

desertcart.com: Merrill MFG 4" Well Seal Cap with Single Top Plate – Single Drop 1-1/4" Water Well Seal for Submersible or Jet Pumps, Heavy-Duty Construction for 4 Inch Well Casing : Industrial & Scientific

Review: Replaced a old cast iron one - Fit the casing perfect
Review: Needed 5” cap - Quality clean work

## Features

- For use with 4 in. inside diameter well casing
- 1-1/4 " Drop Pipe
- Retaining nuts allow for secure installation and easy removal
- Molded PVC plastic for high durability
- Easy to Install
- CALIFORNIA PROP 65 WARNING: Product may expose you to chemicals known to the State of California to cause cancer and reproductive harm. See P65Warnings.ca.gov for details

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09MGD5LF5 |
| Best Sellers Rank | #63,862 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #54 in Water Pump Accessories |
| Brand | Merrill |
| Brand Name | Merrill |
| Color | White |
| Connector Type | Cap |
| Customer Reviews | 4.4 out of 5 stars 132 Reviews |
| Exterior Finish | Zinc |
| Manufacturer | Merrill Manufacturing Company |
| Manufacturer Part Number | WS400125P-A |
| Material | ABS plastic , zinc-plated steel |
| Material Type | ABS plastic, zinc-plated steel |
| Model Number | WS400125P-A |
| Number of Pieces | 1 |
| Size | 1.25 inches |
| Thread Size | 4 |
| Thread Type | UNF |
| UPC | 642367451707 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Merrill
- **Color:** White
- **Connector Type:** Cap
- **Exterior Finish:** Zinc
- **Manufacturer:** Merrill Manufacturing Company
- **Material:** ABS plastic, zinc-plated steel
- **Number of Pieces:** 1
- **Size:** 1.25 inches
- **Thread Size:** 4
- **Thread Type:** UNF

## Images

![WS400125P - Image 1](https://m.media-amazon.com/images/I/51D-JhYQaIL.jpg)
![WS400125P - Image 2](https://m.media-amazon.com/images/I/51zYXu3UNiL.jpg)
![WS400125P - Image 3](https://m.media-amazon.com/images/I/51qGgBYFRpL.jpg)
![WS400125P - Image 4](https://m.media-amazon.com/images/I/61Ib3IIqAbL.jpg)
![WS400125P - Image 5](https://m.media-amazon.com/images/I/31ed96pfU8L.jpg)

## Available Options

This product comes in different **Model** options.

## Questions & Answers

**Q: If the ID of my well pipe is 6 and 3/8 will this tighten down enough ?**
A: It’s made for a 6 in pipe, yes it will tighten

**Q: Can I hang a 3hp pump and 500’ of boreline off of this?**
A: If your 3hp pump will fit the 6" caseing then this well cap will work for you.  I used 1" outlet from my well pump.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Replaced a old cast iron one
*by W***E on November 17, 2025*

Fit the casing perfect

### ⭐⭐⭐⭐⭐ Needed 5” cap
*by K***S on November 17, 2025*

Quality clean work

### ⭐⭐⭐⭐⭐ Merrill 6" Well Seal Cap with 1 1/4" drop pipe
*by R***P on March 28, 2026*

perfect for the required application

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**Shop now:** [https://www.desertcart.co.uk/products/412023363-ws400125p](https://www.desertcart.co.uk/products/412023363-ws400125p)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-09-07*