---
product_id: 412023363
title: "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"
brand: "merrill"
price: "฿4695"
currency: THB
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.th/products/412023363-merrill-mfg-4-cast-iron-well-seal-cap-with-split
store_origin: TH
region: Thailand
---

# 4-inch well casing fit Zinc-plated steel nuts Easy install & removal 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

**Brand:** merrill
**Price:** ฿4695
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal the deal with Merrill — durability meets effortless precision!

## Quick Answers

- **What is this?** 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 by merrill
- **How much does it cost?** ฿4695 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/412023363-merrill-mfg-4-cast-iron-well-seal-cap-with-split)

## 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

- • **Compact & Lightweight:** At just 1.3 pounds and compact dimensions, it’s easy to handle without compromising durability.
- • **Secure Retaining Nuts:** Engineered retaining nuts provide rock-solid installation with effortless removal when needed.
- • **Streamlined Installation:** User-friendly design means no fuss, saving you time and hassle on every job.
- • **Durable Molded PVC & Zinc Steel:** Crafted from high-grade ABS plastic and zinc-plated steel for long-lasting corrosion resistance and strength.
- • **Precision Fit for 4-Inch Casings:** Seamlessly designed to snugly fit standard 4-inch well casings, ensuring leak-proof performance.

## Overview

The Merrill MFG 4-Inch Well Seal Cap is a robust, easy-to-install solution designed for 4-inch inside diameter well casings with a 1-1/4 inch drop pipe. Made from durable ABS plastic and zinc-plated steel, it offers secure sealing with retaining nuts for reliable, corrosion-resistant performance.

## Description

Merrill MFG 4-Inch Well Seal, Cap, Single Drop 1-1/4 in

## 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 |
|---------------|-------|
| Size | 1.25 inches |
| Material | ABS plastic, zinc-plated steel |
| Brand | Merrill |
| Color | Silver |
| Connector Type | Cap |
| Thread Size | 4 |
| Exterior Finish | Zinc |
| Thread Type | UNF |
| Manufacturer | Merrill Manufacturing Company |
| UPC | 642367451707 |
| Part Number | WS400125P-A |
| Item Weight | 1.3 pounds |
| Package Dimensions | 5.6 x 4.6 x 3 inches |
| Item model number | WS400125P-A |
| Batteries Required? | No |

## Product Details

- **Size:** 1.25 inches
- **Material:** ABS plastic, zinc-plated steel
- **Brand:** Merrill
- **Color:** Silver
- **Connector Type:** Cap
- **Thread Size:** 4
- **Exterior Finish:** Zinc
- **Thread Type:** UNF
- **Manufacturer:** Merrill Manufacturing Company
- **UPC:** 642367451707

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/51D-JhYQaIL.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

### ⭐⭐⭐⭐⭐ Knowing the size of your well cassing
*by G***D on May 3, 2025*

Worked fine

### ⭐⭐⭐⭐⭐ well cap
*by N***E on February 15, 2025*

i had to wait a bit but just what i wanted

### ⭐⭐⭐⭐⭐ exactly what we needed
*by J***E on January 22, 2025*

Now our well looks like it was installed by a pro, even though we are DIYers. Exactly what we needed.

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**Shop now:** [https://www.desertcart.co.th/products/412023363-merrill-mfg-4-cast-iron-well-seal-cap-with-split](https://www.desertcart.co.th/products/412023363-merrill-mfg-4-cast-iron-well-seal-cap-with-split)

---

*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-20*