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The B&K 521-400HC is a reliable 1/8 inch malleable black iron cap manufactured by Mueller B&K. This durable cap is designed to seal the end of a pipe for solid closure. It is an essential component for plumbing applications where a secure and reliable seal is required.
This cap is ideal for creating a complete seal on pipes and is commonly used in HVAC and plumbing systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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