Collar Plugs • Protects boreholes from backfill • Wide range of sizes • Bright red for easy visual inspection • Economical Specifications Borehole Size 1″ – 2″ 2″ – 2.5″ 2″ – 3.5″ 3″ – 5.5″ 5.5″ – 9″ 5.5″ – 11″ 11″ – 18 Item No BBCP-1 BBCP-1A BBCP-2 BBCP-6 BBCP-9 BBCP-10 BBCP-18