---
product_id: 412023363
title: "WS400125P"
brand: "merrill"
price: "€ 107.73"
currency: EUR
in_stock: true
reviews_count: 8
category: "Merrill"
url: https://www.desertcart.gr/products/412023363-ws400125p
store_origin: GR
region: Greece
---

# Secure 1-1/4 inch drop pipe retention Durable molded PVC & zinc-plated steel Fits 4-inch well casing perfectly WS400125P

**Brand:** merrill
**Price:** € 107.73
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal your well with confidence—durability meets precision!

## Quick Answers

- **What is this?** WS400125P by merrill
- **How much does it cost?** € 107.73 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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

- • **Effortless Installation:** Designed for quick, hassle-free setup—get your well sealed and protected in no time.
- • **Trusted by Professionals:** Highly rated with 4.5 stars and top 105 rank in Water Pump Accessories—join the savvy pros upgrading their wells.
- • **Robust Drop Pipe Retention:** 1-1/4 inch drop pipe compatibility with retaining nuts for rock-solid, easy-to-remove installation.
- • **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 & Zinc Finish:** Combines corrosion-resistant molded PVC with zinc-plated steel for unmatched durability in harsh environments.

## Overview

The Merrill WS400125P is a heavy-duty 4-inch well seal cap designed for submersible or jet pumps. Featuring a 1-1/4 inch drop pipe with retaining nuts, it ensures secure, easy installation. Constructed from molded PVC and zinc-plated steel, it offers superior durability and corrosion resistance, making it a top choice for professional-grade well maintenance.

## Description

desertcart.com: Merrill MFG 4" Cast Iron Well Seal Cap with Split 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09MGD5LF5 |
| Batteries Required? | No |
| Best Sellers Rank | #125,979 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #105 in Water Pump Accessories |
| Brand | Merrill |
| Color | White |
| Connector Type | Cap |
| Customer Reviews | 4.5 4.5 out of 5 stars (109) |
| Date First Available | November 24, 2021 |
| Exterior Finish | Zinc |
| Item Weight | 1.3 pounds |
| Item model number | WS400125P-A |
| Manufacturer | Merrill Manufacturing Company |
| Material | ABS plastic, zinc-plated steel |
| Number of Pieces | 1 |
| Package Dimensions | 5.6 x 4.6 x 3 inches |
| Part Number | WS400125P-A |
| Size | 1.25 inches |
| Thread Size | 4 |
| Thread Type | UNF |
| UPC | 642367451707 |

## 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)

## 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

### ⭐⭐⭐⭐⭐ Does the job it is intended to do!
*by A***C on February 1, 2026*

Installed this along with a new well pump at the ranch and it worked exactly as it was supposed to.

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

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-08*