How well a drain odour stopper sits on the strainer depends on choosing the right size. A product that is too small will not cover the whole strainer; one that is too large may overhang onto the floor around it. This article explains how to measure kitchen and bathroom floor drains, what to watch for with round and square strainers, and how to plan sizes for bulk orders.
Drain odour stoppers in brief
A drain odour stopper is a flexible soft PVC product placed on top of kitchen and bathroom floor drains. Sitting on the drain under its own weight and flexibility, it helps reduce the passage of odour. The right size is important for it to sit properly.
Step 1: Identify the strainer type
Floor drains are usually round or square. Some have a removable grate (cover) on top, others a fixed grate. Identifying the shape and top surface before measuring clarifies which dimension to use.
Step 2: Measure the visible grate
Because the product sits on the top surface of the strainer, the dimension to use is the visible size of the grate:
- Round strainers: measure the diameter from one edge of the grate to the opposite edge, through the centre.
- Square strainers: measure the length of one side of the grate. The corner-to-corner measurement can also be noted.
Measuring in millimetres and checking a few times prevents a wrong choice.
Step 3: Check the surrounding surface
Is the floor around the strainer flat or sloped? Is the strainer flush with the floor or slightly recessed? These details affect how the product sits on the strainer. In shower areas, floors sloping towards the strainer are common.
Step 4: Choose a suitable model
As a general approach, choose a model that fully covers the strainer grate based on your measurement. Compare your strainer size with the size information on the pack or in the quote. If you are unsure, sharing a photo and the measurement of the strainer helps us decide on the right model together.
Kitchen versus bathroom
In some buildings kitchen floor drains differ in size from bathroom ones, and professional kitchens may use larger strainers. It is therefore useful to measure kitchen and bathroom separately.
Size planning for bulk orders
Projects such as hotels, dormitories, residential complexes or factories often have more than one strainer type. Listing the size and quantity of each type simplifies supply; for example, a list like “square 10 cm: 120 pcs, round 8 cm: 40 pcs” makes the need clear. For hardware and DIY shelves, identifying the most requested sizes helps build the right range.
Project-specific sizes
Besides standard kitchen and bathroom strainer sizes, requests for custom diameter and wall thickness for large projects such as hotels, dormitories and factories are assessed per project and clarified in the quote.
Common mistakes
- Measuring the inner hole instead of the visible size of the grate
- Measuring only corner to corner on a square strainer
- Assuming kitchen and bathroom strainers are the same size
- Ignoring the slope of the surrounding floor
Recording the sizes
In homes or businesses with several drains, noting each drain’s size once makes later purchases easier. Since the kitchen sink, bathroom basin and shower drain can differ, a separate note can be kept for each. For businesses buying in bulk, this list helps set the right quantities and sizes when ordering.
If you are unsure of the size, you can share a photo of the drain and its measurement in the quote form, and we will assess suitable options together.
Frequently asked questions
I don’t know my strainer size. What should I do?
Share a photo of the strainer taken from above with a ruler or tape measure next to it, and we will assess the size together.
Is it a problem if the product is slightly larger than the strainer?
The aim is for the product to fully cover the strainer grate. Share your measurement and we will choose a suitable model together.
Conclusion
The right size is the basis for a drain odour stopper sitting properly on kitchen and bathroom strainers. See our drain odour stopper page for product details, or send your strainer sizes via the quote form.
