uxcell 1/2" PT Male Thread Brass Pneumatic Valve Muffler Silencers Gold Tone Product Name : Pneumatic Muffler;Thread Size : 21mm/ 1/2" PT Overall Size : 45 x 25mm/ 1.8" x 0.98"(L*Max.D);Material : Brass Color : Gold Tone Net Weight : 22g Package Content : 1 x Pneumatic Muffler