If you are fitting a Warmup underfloor heating system, these high quality 36mm washers are essential for a professional installation. Designed for use when fixing the Warmup insulation boards, these 36mm washers will provide a solid and stable construction for your whole system.Supplied in a pack of 50, there are enough washers available to fix approximately 2 boards.If you are fitting Warmup installation boards as part of your underfloor heating system, make sure you add these 36mm washers to your basket.