RubberMaster Plus 18x8.50/9.50R8 ATV Inner Tube with TR-6 Valve Stem

I purchased these innertubes for the back tires on my Zero-Turn mower. The tires are tubeless, but I find they require inflation less often with innertubes inside, Valve stems are the most problematic part of any innertube. It is easy to have them turn at an angle in the wheel hole, when the tube is first inflated. Protruding from the wheel, they are also susceptible to damage while mowing. Here in Florida we mow all year. Our blazing Florida sun, will deteriorate almost anything. This includes rubber valve stems. This tube has a threaded metal valve stem. The thread on nuts hold this valve stem securely in place, even without air in the tire. Being metal instead of rubber, they are much less susceptible to damage or deterioration. One may find less expensive innertubes, but do yourself a favor and purchase these instead, They will outlast the others by a mile,