Description Poly Plugs 1/2" work to seal termite treatment holes. Poly Plugs 1/2" are jused after pesticides are injected, and they can render the area undetectable. Poly Plugs 1/2" are for use with 1/2" holes, and come at 500 per bag. Application: seals termite treatment holes. Use on: slabs, block, and masonry holes.