Blagdon 20-40mm Flow Regulator

40mm - The equivilent of 4cm

Pond Keeper are an online retailer of pond equipment for the garden. The company are based in Billingham and have an extensive warehouse of pond related products. They sell all the equipment that you could possibly need to create and maintain your garden pond. They stock products such as liners, pumps, filters, lighting, waterfalls, plants, hoses, clips and fittings. Through their website you can also get tips on building your pond, the best products to use and follow their blog on keeping a pond. They also sell other gardening products to compliment their range. So if you are looking to design your own pond or maintain the one you have, then Pond Keeper have the products for you.