Check the listing for details. GRAINGER APPROVED SBM-4PG Dust Plug,Type DP,Polypropylene,4" 6YZG1. Condition: New. Listed at 156.53 USD. Dust Plug, Plug, For Coupling Size 4 in, Body Material Glass Filled Polypropylene, Type DP, Coupling Size 4 in, Natural, Overall Length 5 in, Includes Locking Arm No, Plug Length 5 in Type DP antistatic polypropylene cam and groove dust plugs plug into Type B, C, and D female couplers to seal the end of the connection. Dust plugs seal leaks and prevent debris or other materials from entering the connection. Antistatic polypropylene (also called PP) is a thermoplastic material with an antistatic additive that resists UV, weathering, corrosion, and reduces or eliminates static buildup. Antistatic polypropylene dust plugs are used with pharmaceuticals, dry food materials, and chemical movement and storage.Polypropylene cam and groove fittings consist of a grooved male nipple (adapter) and a f.