Get ready for clean and pure drinking water at your fingertips with the H2O International US4-13 Under Sink Filter System. This advanced water filtration solution boasts a 25,000-gallon capacity, providing you with long-lasting access to quality water for drinking and cooking. Designed to replace NSA 100S and 100X Water Systems, the US4-13 features a 3/8-inch Quick-Connect Fitting, ensuring a hassle-free installation process. Featuring a robust 5-stage filtration and purification system, the US4-13 effectively removes impurities from your water, including chlorine, heavy metals, and sediment. The result is fresh and clean water that enhances the taste of your beverages and dishes. The easy installation kit, complete with quick-connect fittings, simplifies the replacement process, making it a user-friendly addition to your kitchen. Made in the U.S.A., the H2O International US4-13 is a testament to quality and reliability. The included NSA 100S and 100X Replacement filters are specifically crafted to deliver superior filtration, ensuring that you and your family enjoy the purest water possible. The compact design of the US4-13 means it won't take up valuable counter space, while the convenient inline hookup to the sink faucet allows for instant access to filtered water. Say goodbye to the inconvenience of buying bottled water and embrace the H2O International US4-13 Under Sink Filter System. Investing in this system is an investment in your health and well-being, providing you with the confidence that you're enjoying the benefits of clean, pure water straight from your tap. Don't compromise on water quality; choose the H2O International US4-13 and elevate your hydration experience. Order yours today and savor the difference of having a reliable and efficient undersink water filter in your home.