The part needed is MCKADJTOOL. Thank you.

Merrill titles adapter

Thank you for your question. If the thumbscrew on the top of the pitless adapter has broken off, the pump can usually still be removed, but the exact method depends on which part of the thumbscrew broke and whether the threaded portion is still inside the adapter. In many cases, the broken screw can be removed using a screw extractor (easy-out) after drilling a small pilot hole in the center of the broken piece. Once the screw is removed, the pitless adapter can be loosened and the drop pipe and pump can be pulled normally. If the screw is completely seized or the head broke off flush with the adapter, a well contractor may need to remove it using specialized tools to avoid damaging the pitless adapter or dropping components into the well. Because well pump systems vary and repairs at the well head can affect the integrity of the installation, we generally recommend having a qualified well technician handle removal if the screw cannot be safely extracted. If you’re able to share a photo of the broken thumbscrew area, we may be able to help identify the best next step.

Merrill MCKNL410 MCKNL 4" X 1" No-Lead Bronze Clear Well Pitless Kit

Part #:MCKNL410
Model #:MCKNL
Condition:Brand New

List Price: ~~$258.00~~
$143.16 / Kit
You Save: 44.51%
Free Shipping

List Price: ~~$258.00~~
$143.16 / Kit
You Save: 44.51%
Free Shipping

1 Week Factory Lead Time

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Description

Overview

The Merrill MCKNL410 MCKNL 4" X 1" No-Lead Bronze Clear Well Pitless Kit provides a safe and efficient solution for well water systems. Crafted with robust No-Lead Brass/Bronze castings and a flipper/wedge design, this kit ensures a reliable and maintenance-friendly water supply. It's designed for 4" well casings with a 1" discharge.

Key Features

Full-Diameter Well Access: Allows unobstructed access for easy well maintenance and pump pulling.
Discharge Hub with U-Bolt and Back Strap: Prevents distortion of plastic well casings, ensuring a secure fit.
Versatile Casing Compatibility: Works with both plastic and steel casings, offering a cost-effective solution.
Heavy Duty Galvanized Support Bar: Supports 160% more weight than standard aluminum, minimizing the risk of pipe or pump loss.

Specifications

Type: Clear Well Pitless Kit
Size: 4" x 1"
Material: No-Lead Brass/Bronze Castings, Galvanized Support Bar
Casing Compatibility: Plastic or Steel

Applications

Ideal for residential and commercial well water systems requiring a reliable pitless adapter.
Suitable for new well installations or replacements in existing systems.
Used to provide a sanitary and frost-free connection between the well and water supply line.

Performance and Characteristics

Ensures a safe and contaminant-free water supply with no-lead materials.
Provides easy access for well maintenance and pump servicing.
Offers robust support to prevent pipe or pump loss during installation and operation.
Designed for long-lasting durability and reliable performance.

Additional Information

Features a flipper/wedge design for secure connection.
Discharge hub clamps around well casing to prevent distortion.

Ensure a safe and reliable well water system. Choose the Merrill MCKNL410 MCKNL 4" X 1" No-Lead Bronze Clear Well Pitless Kit for your installation.

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Specification Sheet
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Questions & AnswersHave a Product Question?

Popular Questions

Created on: Mar 18, 2026, 10:28 PM by Donna C.
Thumb screw
What tool do I need to losing up a non broken thumb screw? To be able to pull my pump up? Do you sell such a tool to remove the pitless adapter?
Answer
- Created on: Mar 19, 2026, 11:41 AM by Admin
  The part needed is MCKADJTOOL. Thank you.
  (0)
  (0)
Created on: Mar 6, 2026, 10:18 AM by Robert R.
Merrill titles adapter
How can I remove my pu mp when the thum screw on the top of the adapter broken off?
Answer
- Created on: Mar 9, 2026, 5:32 PM by Admin
  Thank you for your question. If the thumbscrew on the top of the pitless adapter has broken off, the pump can usually still be removed, but the exact method depends on which part of the thumbscrew broke and whether the threaded portion is still inside the adapter. In many cases, the broken screw can be removed using a screw extractor (easy-out) after drilling a small pilot hole in the center of the broken piece. Once the screw is removed, the pitless adapter can be loosened and the drop pipe and pump can be pulled normally. If the screw is completely seized or the head broke off flush with the adapter, a well contractor may need to remove it using specialized tools to avoid damaging the pitless adapter or dropping components into the well. Because well pump systems vary and repairs at the well head can affect the integrity of the installation, we generally recommend having a qualified well technician handle removal if the screw cannot be safely extracted. If you’re able to share a photo of the broken thumbscrew area, we may be able to help identify the best next step.
  (0)
  (0)

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