How to Choose the Right Drain Assembly for Your Bathtub

The right drain assembly will complement your bathtub and fit seamlessly with your overall decor. Whether you're installing a new bathtub or replacing an existing drain, understanding the components, measuring accurately, and selecting materials that match your needs are key steps to achieving an optimal fit and performance. 

Types of Bathtub Drain Assemblies

1. Lift-and-Turn Drains

Lift-and-turn drains are one of the most popular and straightforward types of drain assemblies. They feature a small knob on top of the drain stopper that you can lift and turn to open or close the drain. 

2. Toe-Touch Drains  

Toe-touch drains, also known as foot-operated drains, offer a hands-free operation by simply pressing the stopper with your foot to open or close the drain.

3. Flip-It Drains  

Flip-it drains feature a stopper that rotates to open or close the drain, using a simple twist motion. 

4. Trip-Lever Drains  

Trip-lever drains are more complex and involve a lever mounted on the overflow plate that controls the drain stopper via a linkage and plunger system. Trip-lever drains are commonly found in older or more traditional bathtub installations.

5. Chain and Plug Drains

Chain and plug drains are a more niche type of drain and are most commonly paired with a vintage or clawfoot tub. The chain helps to prevent the plug from getting lost and adds a stylistic flair to the tub.

Learn more about the functions of each type of bathtub drain.

High-Flow Drain Assemblies

For bathtubs with larger water capacities, such as soaking or whirlpool tubs, high-flow drain assemblies can significantly improve drainage speed. These assemblies are designed with larger drain openings and optimized flow paths to quickly remove water from the tub, reducing wait times after bathing. 

Standard Drain Sizes

Most modern bathtubs and drain assemblies are designed to adhere to standard sizing, which simplifies the selection process. Typically, standard drain openings measure between 1.5 and 2 inches in diameter, and standard overflow heights are set to accommodate common bathtub depths.

Some bathtubs, especially older, custom, or designer models, may have non-standard sizes for drain openings or overflow heights. Custom drain assemblies might require precise measurements and may involve additional costs due to their tailored nature.

Universal Drain Fits

Universal fit drain assemblies are designed to accommodate a broad range of bathtub sizes and styles, offering flexibility and ease of installation. These assemblies often include adjustable components, such as extendable overflow pipes or multi-fit drain shoes, which allow them to adapt to various tub configurations. Universal fit drains are ideal for those looking for a quick and versatile solution. They are especially useful in renovations where tub dimensions may not be entirely clear or when working with older plumbing setups that have been modified over time.

Measuring for a New Tub Drain

1. Measuring the Drain Opening Size  

The first step in measuring for a new tub drain is to determine the size of the existing drain opening. Use a tape measure to find the diameter of the drain hole at the bottom of the bathtub. Most standard bathtubs have a drain opening of about 1.5 to 2 inches in diameter, but it’s important to measure precisely, as some older or custom tubs may have non-standard sizes. 

2. Measuring the Overflow Pipe Position  (if rough-in plumbing is accessible)

The overflow pipe is responsible for diverting excess water away from the tub when it reaches a certain level. To measure its position, find the distance from the center of the overflow plate to the center of the main drain opening. This measurement is critical because it ensures the overflow pipe will align correctly with the drain assembly. Make sure to take this measurement with the tub fully accessible, as misalignment can lead to installation challenges or leaks.

3. Measuring the Overflow Depth  

Overflow depth refers to the vertical distance from the bottom of the bathtub to the center of the overflow hole. This measurement determines how much water the tub can hold before the overflow starts to function. To measure, place a ruler or measuring tape at the bottom center of the tub (where the drain is located) and extend it up to the overflow hole. Accurate measurement of overflow depth ensures the drain assembly's overflow plate will sit correctly on the tub wall without being too high or too low.

4. Measuring the Waste Arm length  

The drain shoe is the horizontal pipe that connects the main drain opening to the plumbing beneath the bathtub. To measure the drain shoe length, measure from the center of the drain opening to the point where the shoe connects to the main plumbing line.

5. Measuring Tub Depth/Height  

Measuring the depth or height of your bathtub is important for selecting a drain assembly that matches the tub’s overall dimensions and water capacity. To measure the tub depth, place your measuring tape at the deepest point of the tub (usually near the drain) and extend it vertically to the top edge of the tub. 

6. Assessing Access for Installation  

Before finalizing your drain assembly selection, evaluate the access you have to the bathtub’s plumbing. Check whether there is an access panel, open space beneath the tub, or whether you need to work through the wall behind the tub. Limited access can affect the ease of installation and might restrict the type of drain assembly that can be used.

Choosing the Right Drain Color Finish

Chrome: Chrome is one of the most popular and widely used finishes due to its sleek, shiny appearance and versatility. It matches many bathroom styles, from modern to traditional, and is easy to clean. Chrome finishes are also durable and resistant to corrosion, making them a practical choice for high-moisture environments like bathrooms.

Brushed Nickel: Brushed nickel is known for its warm, soft, and slightly muted appearance, making it a popular choice for those seeking a more understated and elegant look. It pairs well with a wide range of bathroom colors and styles, including contemporary and rustic designs. The brushed texture helps hide fingerprints and water spots, reducing the need for frequent cleaning.

Oil-Rubbed Bronze: Oil-rubbed bronze has a dark, rich, and antique appearance that adds a touch of luxury and sophistication to the bathroom. This finish is ideal for vintage, traditional, or Tuscan-style bathrooms, where warm and dark tones are prominent. Oil-rubbed bronze is known for its ability to hide water spots and fingerprints, making it low-maintenance.

Matte Black: Matte black is a contemporary and bold finish that has gained popularity in modern and minimalist bathroom designs. It provides a striking contrast against light-colored bathtubs and tiles, creating a dramatic and stylish effect. Matte black finishes are resistant to fingerprints and water spots, making them easy to maintain.

Polished Brass: Polished brass offers a classic, bright, and luxurious look that works well in traditional or vintage-inspired bathrooms. It is highly reflective and adds a touch of warmth and opulence. Polished brass is resistant to tarnishing and corrosion, especially if it has a protective lacquer coating.

Overflow Plate Covers

Bathtub overflow plates come in a variety of styles, shapes, and finishes, from simple flat covers to more functional designs featuring trip levers. Choosing an overflow plate can add a touch of elegance or personal style to your bathtub. Some overflow covers include integrated features, such as overflow outlets that can be adjusted or closed entirely, allowing you to control the water level in the tub more precisely.