This essential pneumatic tool is ideal for any vehicle trunk, home garage, or automotive shop. Dual head chuck inflator gauge is made of heavy duty construction which provides for long life, even under extreme use and conditions. Equipped with magnifying lens for full view of scale. Milton Industries specializes in tire inflator gauges and this original S-506 dual chuck inflator gauge was the first gauge of its kind ever built in the industry. Milton (S-211) 1/4" NPT M-Style Coupler and Plug Kit (5-Piece) This five piece M style coupler kit includes various couplers and plugs with a 1/4" basic flow size. Milton's M style Kwik Change couplers are made of brass, while the M style Kwik Change couplers are made of case-hardened steel and are plated to resist rust. This collection of couplers, plugs will interchange with all manufacturers who comply with the dimensional requirements of military specification MIL-C-4109. M style couplers and plugs offer up to 300 PSI and has an air flow of 40 SCFM.