− Decrease quantity for Wilesco 01540 Water gauge glass, 27 mm diameter with bolts, nuts and sealing rings (Nickle plated only, for the brass models you will need 01543 to replace nuts and bolts) for Wilesco D 4, 6, 8, 10, 101, 106, 365-499, 52 Quantity + Increase quantity for Wilesco 01540 Water gauge glass, 27 mm diameter with bolts, nuts and sealing rings (Nickle plated only, for the brass models you will need 01543 to replace nuts and bolts) for Wilesco D 4, 6, 8, 10, 101, 106, 365-499, 52 Add to cart