*PLUMBERSSTOCK EXPERT* responded:
Good day! We appreciate your interest in our Canplas 414434BC. No, it is not the same as the P1906 adapter. The inside square measures 4.52"(length) x 3.53" (width) x 2.13" (depth). Here is the submittal sheet should you want to view the line drawings. If you wish to purchase this product, click Add To Cart then you'll be all set! If you need to know more about this product before you buy it, please let us know. We are not here to just make a sale but we are here to help you be happy and confident in your purchase decisions. Thank you for shopping with plumbersstock.com – the perfect place to find high-quality products at low, low prices!