Kohler 1137-7 Underscore® 72" x Review (2026): A Spec-Based Look
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This kohler 1137 7 underscore 72 x review focuses on the Kohler Underscore 72-Inch Drop-in tub. It is a drop-in model designed for seamless installation into a surrounding deck or framing. The defining specs are its length and color. The tub measures 74.4 inches in length, providing ample space for soaking. It comes in a sleek black finish, which contrasts sharply with standard white bathrooms. This specific model, identified by the K-1137-7 number, weighs 110 pounds. Its substantial weight suggests a durable construction suitable for long-term use. The width is 44.4 inches, and the height is 25.3 inches, offering a standard profile for most bathroom layouts.
What stands out
- 74.4-inch length provides generous soaking space
- Black finish offers a modern, high-contrast look
- Drop-in design allows for custom deck integration
- 110-pound weight indicates solid build quality
Who it fits
Good fit for
You should consider this tub if you are building a custom bathroom with a framed deck. The drop-in style requires you to install it into a surround, so it suits renovations where you control the framing. The black color works well in contemporary or industrial designs. The 74.4-inch length is ideal for taller individuals or those who prefer deep soaks. If you want a durable, straightforward soaking tub without complex jets, this model fits your needs. The standard height of 25.3 inches ensures easy entry and exit for most users.
Who should skip it
Skip this option if you need a freestanding tub. The drop-in design requires a custom deck or surround, which adds to installation complexity. It is not suitable for quick replacements in existing alcoves without remodeling. If you prefer a white or neutral color, you will need to choose from the other available options like Biscuit or White. The black finish may show water spots or hard water stains more easily than lighter colors. Also, if you want a compact tub under 72 inches, this 74.4-inch length might be too large for smaller bathrooms.
Verdict: The Kohler Underscore 72-Inch Drop-in tub is a solid choice for custom bathrooms with a modern aesthetic. Its size and build quality make it suitable for serious soaking, provided you can accommodate its installation requirements.
Key specs explained
Type: drop-in
This installation style requires the tub to sit inside a framed opening surrounded by a deck or vanity. You need to build or modify your bathroom structure to support it. This option offers a built-in look that integrates with your decor. It differs from freestanding models that stand alone on the floor. Check your framing dimensions carefully to ensure a proper fit.
Length: 74.4 inches
The overall external length is slightly over 74 inches. This dimension dictates the minimum space required in your bathroom. You must measure your available area to ensure this tub fits without blocking doors or fixtures. Compare this to standard 72-inch models, as the extra length provides more legroom. Verify your layout allows for this specific footprint before purchasing.
Width: 44.4 inches
The external width measures 44.4 inches. This provides a generous seating area for most adults. You should verify that your bathroom layout accommodates this width alongside other fixtures. A wider tub often allows for more comfortable soaking positions. Compare this to narrower soaking tubs if you prefer a more compact footprint. Ensure there is enough clearance for easy access and maintenance.
Height: 25.3 inches
The exterior height is 25.3 inches. This determines how high the tub sits above the floor. You must consider your comfort level when entering and exiting. A taller tub may require a step or stool for some users. Compare this height to lower-profile models if you have mobility concerns. Ensure your deck or framing can support this vertical dimension for a level installation.
Color: Black
The finish is black. This color creates a bold, modern aesthetic that contrasts with light tiles or walls. You should be aware that darker finishes may show water spots or soap residue more easily. Regular cleaning is necessary to maintain the appearance. Compare this with white or biscuit options if you prefer a more traditional or low-maintenance look. Ensure your bathroom lighting complements the dark tone.
Design and build details
According to the listing, the Kohler Underscore 72-Inch Drop-in tub features a sleek, rectangular profile. It measures 74.4 inches in length, 44.4 inches in width, and 25.3 inches in height. These dimensions define the footprint you need for your bathroom layout. The tub weighs 110 pounds, which you must account for when planning the floor structure and framing support. This weight ensures stability during use but requires sturdy installation.
The model number K-1137-7 identifies this specific variant. You can choose from three color options: Black, Biscuit, or White. The listing highlights the Black finish for this particular unit. This dark tone contrasts sharply with light tiles or wood decks, creating a modern aesthetic. It also shows how the tub integrates into your surrounding cabinetry or deck structure. The drop-in style means the rim rests on the deck, hiding the sides from view.
This design prioritizes clean lines and minimal visual clutter. The rectangular shape maximizes interior space for soaking. You benefit from a straightforward installation process if your framing matches the 74.4 by 44.4 inch opening. The consistent height of 25.3 inches across variations ensures uniformity in your bathroom design. You should verify that your deck supports the weight and fits the exact exterior dimensions provided.
Setup and daily use details
Setting up this Kohler Underscore model requires careful planning for its substantial size and weight. The listing specifies a length of 74.4 inches and a width of 44.4 inches. These measurements dictate the framing and deck space you must prepare. Because it is a drop-in design, you need to construct a sturdy enclosure that supports the tub’s edges. The unit weighs 110 pounds. This mass means you should plan for proper floor support and likely need assistance during placement. The height is 25.3 inches. This dimension affects how high the rim sits above your finished deck. You will need to align your surrounding materials to match this height for a seamless look. The tub comes in black, biscuit, or white. Choose the color that matches your existing fixtures or tile work. Daily use involves filling the basin with water. The rectangular shape provides a straightforward layout for bathing. You place the drain and overflow components according to standard plumbing codes. The smooth surface allows for easy cleaning. You simply wipe down the interior after use. The black finish may show water spots or mineral deposits more than lighter colors. You might need to clean it more frequently to maintain its appearance. The sturdy construction ensures it holds water without flexing. You enjoy a stable bathing experience. The dimensions provide ample space for most adults. You can stretch out comfortably within the 72-inch length designation. The wide 44.4-inch width allows for easy entry and exit. You do not need to squeeze into a narrow space. The setup is a one-time effort. The daily routine is simple maintenance.
Before you buy the Kohler Underscore
This Kohler Underscore 72-Inch Drop-in tub requires precise framing. You must verify your bathroom layout accommodates its 74.4-inch length and 44.4-inch width. The 25.3-inch height dictates your deck level. Ensure your floor supports the 110-pound weight. This model is available in Black, Biscuit, and White. Choose the color that matches your existing fixtures. As a drop-in unit, it needs a custom surround. You will need waterproofing materials and deck construction supplies. Maintenance involves regular cleaning of the surface. Avoid abrasive tools that might scratch the finish. Compare this option with other soaking tubs in our guide. It suits those who prefer a built-in look over freestanding styles. Verify your plumbing aligns with the drain position. This specification-focused review helps you decide if this size fits your space. Check all dimensions before ordering to avoid installation issues.
Check before you buy
- Verify your bathroom can fit the 74.4-inch length
- Confirm your floor supports the 110-pound weight
- Plan for the required deck and framing materials
- Choose from Black, Biscuit, or White color options
- Ensure plumbing aligns with the drain position
The product at a glance
Kohler Underscore 72-Inch Drop-in
Best for: spacious bathrooms seeking minimalist soaking
- Type
- drop-in
- Length
- 74.4 inches
- Color
- Black
- Dimensions
- 74.4 × 44.4 × 25.3 inches
- Weight
- 110 pounds
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The Kohler Underscore is a 72-inch drop-in soaking tub designed for modern bathrooms. It measures 74.4 inches long, 44.4 inches wide, and 25.3 inches high. The unit weighs 110 pounds and comes in black, biscuit, or white. Its minimalist rectangular shape fits well in contemporary spaces. You will need a sturdy deck to support its weight and size.
Pros
- 72-inch length provides ample soaking space
- 25.3-inch height allows for comfortable immersion
- Available in black, biscuit, and white finishes
- Durable drop-in design for easy installation
Cons
- Heavy 110-pound weight requires reinforced flooring
- Large footprint needs a spacious bathroom layout
- Rectangular shape may not suit curved decor
Good fit if
- You want a minimalist, rectangular soaking tub
- You have a large bathroom with reinforced flooring
- You prefer a drop-in installation style
Skip if
- You need a compact tub for a small bathroom
- You cannot support a 110-pound unit
- You prefer an alcove or freestanding model
Verdict: Kohler Underscore 72 inch Drop-in Bathtub is a solid choice for those seeking a large, rectangular soaking tub. It fits best in spacious, modern bathrooms where you can accommodate its substantial size and weight.
Specifications side by side
| Spec | Kohler Underscore 72-Inch Drop-in |
|---|---|
| Type | drop-in |
| Length | 74.4 inches |
| Color | Black |
| Dimensions | 74.4 × 44.4 × 25.3 inches |
| Weight | 110 pounds |
| Model | K-1137-7 |
Frequently asked questions
Is the Kohler Underscore 72-inch tub suitable for deep soaking?
Yes, the Kohler Underscore offers deep soaking capabilities. Its height measures 25.3 inches, allowing you to submerge your body significantly. This dimension supports a relaxing, immersive bath experience. The rectangular design complements this depth by providing ample space for your limbs. It is ideal for those who prioritize water volume and comfort in their bathroom routine.
How much floor space does the Kohler 1137-7 require?
You need a footprint of 74.4 inches in length and 44.4 inches in width. These external dimensions ensure the tub fits securely within your framed opening. Plan your bathroom layout to accommodate this substantial rectangular shape. The length allows for full-body extension, while the width provides stability. Proper spacing around these measurements is essential for a clean, integrated look.
What color is the Kohler Underscore model K-1137-7?
This specific model features a sleek black finish. The color adds a modern, minimalist aesthetic to your bathroom decor. It contrasts sharply with typical white tiles or light countertops. This bold choice suits contemporary design schemes. The consistent color extends throughout the tub, ensuring a uniform appearance that complements dark or neutral bathroom themes.
Does the Kohler Underscore drop-in tub come pre-drilled for faucets?
The product data does not specify faucet hole configurations. As a drop-in model, it typically requires you to install faucets separately on the surrounding deck or wall. You will need to coordinate with a plumber for this setup. Check your local building codes and fixture requirements before purchasing. This flexibility allows you to choose your preferred faucet style and placement.
Can a single person install the Kohler 1137-7 tub?
Installation is challenging due to the tub's size and weight. It weighs 110 pounds, making it difficult to maneuver alone. The drop-in design also requires precise framing and deck construction. You should consider hiring a professional installer to ensure proper support and alignment. Careful planning is necessary to handle the substantial dimensions and secure placement safely.
Is the Kohler Underscore 72-inch tub heavy?
Yes, the tub weighs 110 pounds. This weight indicates a sturdy construction capable of holding water and users securely. Ensure your bathroom floor can support this load, especially if it is on an upper story. The weight also contributes to stability during use. Verify your floor structure can handle the combined weight of the tub, water, and you.