1" Poly tank washer

This listing is for a Pack of 1 Important Sizing Note - Most plumbing products are measured using BSP thread dimensions which measure 1/4 inch larger than that stated, therefore the 1 Inch BSP thread this poly tank washer is made to work with actually measures 1 1/4 Inch in diameter. If the tap thread measures 1 Inch in diameter then you require the 3/4 Inch version of this product To help seal the inlet or outlet connection on 1 inch BSP poly water tank Metric equivalent outside diameter - 59mm, metric equivalent hole diameter - 34.5mm (for information only - metric threads are not compatible with BSP threads), thickness - 1.5mm Material - Plastic