غطاء خلفي للمحرك AeroTech RMS-18/20 - 910042D

Threads onto the case smoothly and the knurled edge gives a solid grip when I'm tightening it by hand. No burrs on the aluminum, and the o-ring groove seals clean every time. Beats the plastic closures I used before by a mile.

Snapped right onto my 18/20 case with zero wobble, and the threads on the aft end take the nozzle retainer cleanly every time. It's reusable, so after a few flights it still seals the same as day one.

Machined aluminum fits the case perfectly and threads on smooth with no binding. I’ve reused it across several reloads and the threads still look crisp, which is exactly what I wanted for a part this small.