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LPG Nozzle Glossary: Terms Used in GG20 Documentation

Updated 2026-10-07 · Sourced from ELAFLEX documentation

Short answer: Short definitions of the terms used across GasGuard GG20 documentation, from 1¾" ACME and nozzle reach to release volume, nose piece types, reed switches, safety breaks and UL 125.
1¾" ACME
The threaded LPG fill connection common on North American forklift cylinders, RVs and older autogas vehicles. The GG20's connector nut screws onto it.
Nozzle reach
Length of the connector nut. 160 mm on the GG20, 125 mm on the GG1.
Nose piece
The sealing front of the valve. Single ('E'), hybrid ('H') or dual ('DN') on GasGuard ACME nozzles.
Dual nose piece
ELAFLEX's patented design that seals to the fill point even if the nozzle isn't fully tightened. Used on the GG20DN.
Release volume
LPG vented when the nozzle is disconnected: the liquid trapped between nozzle valve and fill valve. 1.7 to 1.9 cm³ on the GG20 range.
Low-emission connector
Under South Coast AQMD Rule 1177, a connector releasing no more than 4 cm³ on disconnect.
Inlet swivel
The rotating joint where the hose attaches. ½" or ¾" NPT female on the GG20.
NPT
National Pipe Taper, the US tapered pipe thread standard.
Strainer
300 µm / 50 mesh screen inside the nozzle that stops debris from upstream.
Hold-open latch
A catch that holds the lever open. Optional (L) and not UL listed on the GG20.
Reed switch / magnet
Some dispensers start the pump when a magnet in the nozzle guard leaves a reed switch in the boot. Order option J for these.
Nozzle boot (NB-GG)
The enclosed holster for GasGuard nozzles on the dispenser.
Safety break / pull-away (ARK 19)
A coupling in the hose that separates and seals if a vehicle drives off while connected.
UL 125
The Underwriters Laboratories standard covering flow control valves for anhydrous ammonia and LP-gas, under which the GG20 is listed.
NFPA 58
The Liquefied Petroleum Gas Code published by the National Fire Protection Association, adopted by most US states.
AHJ
Authority having jurisdiction: the agency or official who approves an installation.
K15 / Euro connector
Push-to-connect LPG filler adopted under NFPA 58 for new vehicles. Served by the GG40 or ZVG 2, not the GG20.

Sources

  1. GasGuard Information 2.15: GG20 nozzle range (ELAFLEX, Oct 2015)
  2. GasGuard Information 6.15: part number breakdown (ELAFLEX)
  3. South Coast AQMD Rule 1177, LPG transfer and dispensing
  4. The ins and outs of autogas dispensers (Butane-Propane News)

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