Review on 🚗 Mellbree 4-Pack Tire Valve Extension, 90 Degree Schrader Tire Valve Stem Extension Brass Adaptor for Enhanced Compatibility with Passenger Cars, Strollers, Bicycles, Motorcycles, Trailers, RVs, and Recreational Vehicles by German Diaz

These extensions are impressively made and designed - and if you use them to lengthen rubber valve stems, especially on tubular tires, they will most likely work nice for you. But I've tried them on steel RV valve stems to fit TPMS flow sensors through some "wheel simulators" (stainless hubcaps). Rigidity is really important here, not only to prevent the gauges from dangling, but also to withstand heavy tire gauges and air inflators. The female side of these extensions cannot be compressed enough to provide a rigid connection to rigid steel tubing. An internal O-ring is used for sealing, which makes more than sense in light-duty applications, but the soft rubber compound can't withstand the centrifugal forces of the TPMS sensor or the push/pull of a truck tire. Manometer. Extensions can wobble and twist when there is lateral pressure on the joint - and the seal quickly fails. So four stars - it was my fault I used the wrong tool for the job - but I really can't give these lovely extensions five stars as they didn't fit me, plus the seller's statement that they were "standard". "American Motorhomes" can be used. Tire nipples. While this is technically correct, especially for the already flexible rubber strips, these extensions are no good for abusing the daily air pressure safety checks on large motorhome tires when driving on the road without TPMS. In my case do I have to replace the tubeless steel bars that run through the wheel to get my TPMS system to work, which means taking the wheel off and smashing the tire bead to get at the original stems - expensive and not for the tinkerer, but after two apartments with I learned my lesson from these extensions.