RectorSeal Plumbing Parts & Accessories

RectorSeal Plumbing Parts & Accessories: A Legacy Built on Leak-Free Connections

Few names carry as much weight in the professional plumbing world as RectorSeal. Plumbing parts and accessories are at the very core of what this brand was built on — and that story starts with a single, iconic product. RectorSeal No. 5, introduced not long after the company's founding in 1937, quickly became the most widely used pipe thread sealant in the United States. Decades later, it remains a benchmark product that professionals reach for without hesitation.

The Science Behind RectorSeal Thread Sealants

What sets RectorSeal's plumbing accessories apart is their careful formulation. RectorSeal No. 5 is a soft-set, slow-drying compound that seals, lubricates, and protects threaded pipe connections simultaneously. Unlike hard-setting alternatives, its non-hardening formula allows pipes to be pressurized immediately after application, and permits easy disassembly later without damaging threads — a critical advantage for professionals who may need to service connections down the road.

The No. 5 formula is lead-free, contains no other metals, and is approved for use with potable water — both hot and cold. It handles pressures up to 12,000 psi for liquids and 2,600 psi for gases, and remains brushable across a temperature range of 20°F to 140°F. It's compatible with a wide variety of pipe materials including galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, reinforced fiberglass, and PVC.

A Broader Thread Sealant Lineup for Every Job

RectorSeal's plumbing accessories don't stop at the classic No. 5. The brand's thread sealant family has expanded to cover specialized applications that plumbing professionals encounter in the field:

• RectorSeal No. 5 Special — A variant engineered specifically for use around gas detection equipment, retaining the trusted slow-dry, non-hardening character of the original formula.
• RectorSeal No. 7 — Formulated for corrosive chemical and solvent applications, conforming to AMS-S-7916, delivering exceptional strength where standard sealants fall short.
• RectorSeal No. 21 — A multi-purpose sealant for a broad range of liquids and gases, lead-free, and CSA approved for added compliance confidence.
• T Plus 2 PTFE-Enriched — A higher-performance blend incorporating PTFE and synthetic fibers, allowing immediate pressurization after application and providing superior sealing on demanding connections.

Quality You Can Count On, Every Time

RectorSeal backs its plumbing accessories with on-site chemical batch validation and rigorous testing by experienced engineers — ensuring every can or tube delivers consistent, professional-grade performance. The No. 5 sealant carries NSF and UL compliance, and is approved by IAPMO and CSA, making it suitable for code-compliant residential, commercial, and industrial installations alike. With compatibility across pipe materials from PVC to stainless steel, and fluids ranging from inert gases to hydraulic oils and refrigerants, RectorSeal gives plumbing professionals a versatile, reliable toolkit for virtually any threaded connection challenge.

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