• Pneumatic Lockout
• Prevents pneumatic fitting from being connected to pressurized air source
• Can lockout up to 6 pneumatic devices
• For use with male fittings
• Accommodates ¼ in, 5/16 in, 3/8 in, 7/16 in, ½ in, 9/16 in, 5/8 in, 13/16 in connections
• Measures 1-3/8in wide x 7-3/4in tall, 1/8in thick (33mm x 185mm x 3.2mm)
• Stainless steel construction for corrosion resistance
• Accepts up to 2 padlocks or lockout hasps for multiple worker lockout
• Accepts any Master Lock or American Lock safety padlock with shackle diameter up to 9/32 in

The Master Lock No. S3900 Pneumatic Lockout Device features stainless steel construction for corrosion resistance and fits virtually all male pneumatic fittings. This lockout device prevents pneumatic fitting from being connected to pressurized air source. Device accepts any Master Lock or American Lock Safety padlocks and works with lockout hasps for multiple worker lockout situations.