Internal check valve isolates pump from shock ensuring accurate pressure during removal. Compact design is ideal for rear shock or small wheels with hard to reach valves. Body Brass Check Valve Yes Size (L x W x H) 2.5 x 1 x 3.8 cm1.0" x 0.4" x 1.5" Weight 15 g / 0.52 oz Art.no. TSV-01