GG20 Safety, Codes and Compliance: UL 125, NFPA 58, Latches and Rule 1177

Updated 2026-10-07 · Sourced from ELAFLEX documentation

Short answer: The GG20, GG20H and GG20DN are UL listed to UL 125, and ELAFLEX states the GG1/GG20 series meet NFPA 58 among other standards. The optional hold-open latch is not covered by the UL listing and is not allowed everywhere. Release on disconnect is 1.7 to 1.9 cm³, under the 4 cm³ limit that defines a low-emission connector in South Coast AQMD Rule 1177. Your authority having jurisdiction has the final word on any installation.

Listings and standards

UL 125: GG20, GG20H and GG20DN are listed by Underwriters Laboratories.
ELAFLEX's manual states GG1 and GG20 nozzles meet AS/NZS 1596, NFPA 58, AS/NZS 1425 and EN 12806.
Check for the UL mark on the nozzle you receive, and keep the documentation.

The latch question

The hold-open latch (L) lets the operator take their hand off the lever. ELAFLEX's data sheet states the latch is not UL listed, and its part-number guide notes that not every country or LPG authority allows one. If a quote lists a latch, decide deliberately, and ask your authority having jurisdiction first.

Low-emission rules

South Coast AQMD Rule 1177 (Southern California) has required, since after December 31, 2013, that covered LPG transfers use low-emission connectors, defined as releasing no more than 4 cm³ of LPG on disconnect. The GG20 releases 1.9 cm³ and the GG20H and GG20DN 1.7 cm³. The rule exempts containers under 4 gallons water capacity and cylinders dedicated to recreational vehicles, among others, and requires facilities to keep documentation proving their connectors comply. Other districts may have their own rules.

ACME versus K15 on new vehicles

Butane-Propane News reports that NFPA 58 adopted the K15 "Euro" push-to-connect filler as the style vehicle manufacturers must provide on new LPG vehicles from 2020, and that the 2024 edition lets Euro nozzles be used without specific operator training. Forklift cylinders, RVs and many existing vehicles still use 1¾" ACME fill valves, which is the GG20's job. For K15 vehicles, ELAFLEX makes the GG40.

LPG hazards to train for

Stored as a liquid under pressure and heavier than air: it collects in low spots.
Extremely flammable between about 2% and 10% in air.
Extremely cold when it depressurizes: cold burns to skin and eyes. Wear gloves and safety glasses.
Keep ignition sources out of the transfer area: flames, smoking, static, phones and electrical devices.

If there is an uncontrolled release, stop the transfer, use the emergency stop, move people away and call emergency services if needed.

Quick answers

Is the GG20 a low-emission connector?

Its release on disconnect is 1.7 to 1.9 cm³, below the 4 cm³ limit that South Coast AQMD Rule 1177 uses to define a low-emission connector.

Is the GG20 latch UL listed?

No. ELAFLEX states the optional hold-open latch is not covered by the UL listing.