- Fits Glass Thickness : 4-6mm and 6-8mm - Suitable for Sealing Gaps up to 29mm - Screen Type: Straight When choosing your shower seal, we have tried to make it really simple, the drop down box displayed below are the actual choices you need to make to place a purchase. - Glass Thickness (choose from either 4-6mm or 6-8mm) - Gap to Seal (we cover this in the description below, basically, you want to ensure that the largest gap between your bath and shower screen is sealed, so if the largest gap is 9mm, look for seals that are 10mm, this ensures a water tight seal) - Single or Twin Pack (Twin packs offer more savings!) ECOSPA SHOWER SCREEN SEAL BENEFITS - ECOSPA shower screen seals are high quality replacements for mouldy,.