The polypropylene couplers and adapters are recommended for a maximum working pressure of 125 PSI (1/2′′-1′′) 100 PSI (1-1/4′′-2′′) and 75 PSI (3′′-4′′). Available in sizes 3/4′′ through 4′′.
Boss-lock type DP Dust Plugs are the same as standard Cam & Groove type DP fittings in every size. The exception is in the 8′′ size and the part number is 801-DP-AL.
For Boss-lock type DP part numbers please follow link.