New & Boxed - Purus Round 130mm Dia. SS Grate for Mini Gullies in Vinyl Floors Wave Design Round stainless steel grate for vinyl flooring with the Wave design. Designed to fit Purus' floor gullies with a 130mm grate diameter. The grate is manufactured to ensure a good flow rate and has a K3 load class. The Wave grate can be locked when used with the appropriate locking nuts.