Buy Once.
Installed For Life.

Shop SMCK / MCK Kits

Complete pitless kits for a clean, watertight well connection.

Adapter + Parts in One Kit No guessing. Everything included.
Everything you need in one kit
Easier install from start to finish
Cast no-lead brass and stainless options
Installed View
Installed pitless kit clear casing example
Clear Casing Example
MCK
MCK no lead brass pitless kit

No Lead
Brass Kit

SMCK
SMCK stainless steel pitless kit

Stainless
Steel Kit

Why Buy a Kit Instead of Just an Adapter?

The highest cost in a well system is not the kit—it is the labor and disruption required when the system must be reworked.

The advantage of a complete kit is maintaining clear, open access to the well casing for future service. If the well needs to be re-wired, a screen added or pulled, drilled deeper, or requires any additional work, unrestricted access becomes critical.

What starts as a lower-cost adapter-only installation can quickly become more expensive when modifications or maintenance are required.

A Merrill SMCK/MCK kit includes the adapter, discharge, and support bar—providing all key components needed for a cleaner, stronger, and more dependable connection from the start.

Buy the kit. Do it right. Don’t dig it up.
Avoid the Re-Work. Install the Kit.

Avoid the Re-Work. Install the Kit.

A pitless adapter is only one part of the job. Merrill SMCK/MCK kits include the adapter plus the key components needed for a cleaner, more dependable well connection.

Adapter Only
Pitless adapter only
!
  • ! More installation work.
  • ! Only Use on 5"-6" or larger casing.
  • ! Must dig up or remove if using with 4" casing.
Merrill SMCK/MCK Kit
Merrill SMCK/MCK kit
✓
  • ✓ Adapter + parts in one kit.
  • ✓ Built to install right the first time.
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Installing SMCK

Choose the Right Pitless Kit

Both Merrill MCK and SMCK kits are built for a clear well, dependable pitless connection. Choose based on material preference and job conditions.

MCK

Cast / No- Lead Brass Option
Merrill MCK pitless kit cast brass option

Best for standard well installations and dependable everyday use.

Choose MCK

SMCK

Stainless Option
Merrill SMCK pitless kit stainless option

Best for premium installs, harsh conditions, and long-term corrosion resistance.

Choose SMCK
✓
Quick Pick: Standard install? Choose MCK. Want premium stronger corrosion resistance? Choose SMCK.
Pitless Kit Guide

Common Questions

What is a well pitless kit and why do you need one?

A well pitless kit connects your underground water line to the well casing below frost level, keeping it watertight, freeze-protected, and easy to service or rework well without digging.

Pitless unit vs. adapter vs. kit—what’s the difference?

A pitless adapter is the basic underground connection for 5" and larger well casings. A pitless kit includes the adapter and core parts for existing casings. A pitless unit is a complete casing section with a factory-installed, pressure-tested pitless assembly for quick, low-labor installation.

How do I size a pitless kit for my well casing?

Match the well pitless kit to your casing size — 4", 5", or 6" — then choose the right discharge size. Most SMCK kits are sized for 1" or 1-1/4" pipe, so measure before ordering.

Can I install a pitless kit myself or hire a pro?

You can DIY a well pitless kit, but it’s not a beginner job. You’re cutting casing, setting seals, lifting huge wights, and connecting the water line. Most people hire a licensed well contractor because one bad slip can mean leaks, frozen lines, or rework.

What’s included in a pitless kit?

A well pitless kit usually includes the discharge hub, internal pitless assembly, O-rings or gaskets, and support bar — the main parts needed for a secure well connection. Complete kits save install time and can be used on 4" or longer casing.

Pitless Kits

Build a Secure Underground Well Connection

Shop Pitless Kits →

Merrill pitless kits help connect the underground water line to the well casing below frost level, creating a reliable, watertight connection that protects the system from freezing and makes future service easier.