Postsaver rot-protected and UC4-treated posts are the perfect solution to a long-lasting, high-quality fence that won’t cause stress and hassle down the line. Each post is made from high-quality timber and covered by a 20-year post-replacement guarantee, thanks to Postsaver rot protection being pre-applied. Postsaver’s dual-layer rot prevention technology is the proven solution against ground-line post rot. It works by creating an air and watertight seal around the post's surface, which locks out all the factors required for wood decay: fungi, oxygen, and moisture. Deeper in the ground, there is not enough oxygen for the fungi to survive, so there is no need to protect this part of the post. The 20-year post-replacement guarantee includes rot protection applied for a 2ft (30cm) post-burial depth. Posts can be installed in all the usual methods and are fully compatible with fence post concrete, backfill, and power-driving. UC4 pressure-treated square fence post with Postsaver Rot Protector pre-applied – 75 x 75mm x 1.8m (3 x 3" x 6ft) – 5 Pack. Postsaver Pro-Sleeve Post Rot Protection Shield excludes all the factors required for decay, locking preservatives in and locking moisture, oxygen and fungi out. Preventing costly ground-line rot in your wooden posts. We are dedicated wood life extension specialists. Our mission is to support you with the tools and products you need to protect your fence posts and the investment in your fence for years to come. UC4 Pressure Treated Tanalized Post.