UL 213C 2020-07 PDF

Full title and description

St UL 213C 2020-07 — Grooved and Plain End Fittings. This document is the UL standard (Edition 1 with redline/revision published July 2020) that defines construction, marking and performance requirements for grooved and plain end fittings intended for use with couplings that meet the requirements of UL 213 (Rubber Gasketed Fittings for Fire‑Protection Service).

Abstract

The standard specifies minimum construction and performance criteria, marking and testing requirements for single-piece cast and fabricated grooved or plain end fittings used in fire‑protection piping systems. It is intended to ensure compatibility with couplings and gasketing systems covered under UL 213 and to provide a basis for product evaluation and listing by Underwriters Laboratories.

General information

• Status: Active (current UL standard / redline available).
• Publication date: Original edition published July 8, 2014; Redline/revision published July 29, 2020 (document maintained with subsequent updates through 2025).
• Publisher: Underwriters Laboratories (UL LLC).
• ICS / categories: Protection against fire (ICS 13.220 – fire protection and firefighting equipment).
• Edition / version: Edition 1 (with Redline July 2020).
• Number of pages: Approximately 12–13 pages (typical published PDF size for this edition).

Scope

This standard covers requirements for the construction, marking and performance of grooved and plain end fittings intended to be joined to pipe or another fitting by couplings that comply with the Standard for Rubber Gasketed Fittings for Fire‑Protection Service (UL 213). It applies to one‑piece cast fittings and fittings fabricated from steel pipe that may be segmented and welded to form the fitting, and it defines inspection, test and marking expectations needed for product evaluation and listing.

Key topics and requirements

• Construction requirements for grooved and plain end fittings (materials, dimensions, fabrication methods).
• Performance tests for mechanical strength, pressure performance and compatibility with UL 213 couplings.
• Marking and identification requirements for traceability, manufacturer identification and part/function markings.
• Acceptance criteria for one‑piece cast and fabricated (welded/segmented) fittings.
• Requirements and clarifications introduced in redline/revision documents (marking clarifications and editorial changes implemented in 2020 redline).

Typical use and users

Used by manufacturers of fire‑protection piping fittings, testing and certification laboratories, product compliance teams, engineering firms specifying sprinkler and fire‑protection systems, code officials and procurement/specification writers who need to reference UL listing and performance criteria for grooved and plain end fittings in fire‑protection installations.

Related standards

Key related documents include UL 213 (Rubber Gasketed Fittings for Fire‑Protection Service), the UL 213 subject/outline documents (213C outline revisions), and NFPA installation and design standards such as NFPA 13 (Standard for the Installation of Sprinkler Systems) that reference approved fittings and coupling systems. Other UL outlines and related product standards for hydrants, valves and hose fittings are commonly cross‑referenced in practice.

Keywords

UL 213C, grooved fittings, plain end fittings, fire protection, couplings, rubber gasketed fittings, UL 213, marking, performance, redline July 2020

FAQ

Q: What is this standard?

A: UL 213C is the Underwriters Laboratories standard that sets construction, marking and performance requirements for grooved and plain end fittings used in fire‑protection piping systems, intended to be joined by couplings compliant with UL 213.

Q: What does it cover?

A: It covers the design/construction types (one‑piece cast and fabricated/welded fittings), mechanical and pressure performance tests, marking and identification requirements, and criteria for compatibility with UL 213 couplings.

Q: Who typically uses it?

A: Manufacturers, test labs, certification bodies, specifiers, engineers, and code officials involved in fire‑protection system components and approvals.

Q: Is it current or superseded?

A: The Edition 1 document (originally published July 8, 2014) remains active; a redline revision was published in July 2020 to clarify and document changes. Purchasers should check UL's publication listings for the most recent reaffirmations or amendments.

Q: Is it part of a series?

A: Yes — UL 213C is part of the UL 213 family of documents addressing rubber gasketed and associated fittings for fire‑protection service; related outlines and subject documents (UL SUBJECT 213C) and other UL standards for valves, hydrants and couplings are commonly grouped with it.

Q: What are the key keywords?

A: Grooved fittings, plain end fittings, fire‑protection fittings, couplings, rubber gasketed, UL 213, UL 213C, marking, performance, redline 2020.