Rigid waterproof conduit steel floor pre embedded basement top plate custom-made

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Customized strength of A-type and B-type wall penetrating pre embedded protective closed waterproof conduit from a large factory

Steel floor pre embedded waterproof sleeve, basement through roof, civil air defense sleeve, waterproof wing ring customization

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Flexible national standard rigid AB type pre embedded civil air defense enclosed rib electrical combination air duct

Flexible rigid waterproof sleeve, water stop sleeve, steel sleeve, civil air defense, closed commercial trade behavior