Thank you for using wpj heating, we wish you a great day! We believe this product is specifically for a bathroom sink so would not be suitable for a cess pit. Ensure that your boiler is happy and health with an annual boiler service get in touch to book with us today! There are a few things that you need to ask the professional that you are hiring, such as. With state-of-the-art technology, to find cracked pipes is simple! Free shipping.