Installing a GG20: Hose, Thread Sealing, Safety Break and Boot

Updated 2026-10-07 · Sourced from ELAFLEX documentation

Short answer: The GG20 ships ready to use and must be installed by competent personnel under local codes. ELAFLEX says not to use PTFE tape on the threads, because it doesn't conduct static well and can shed particles; use a non-permanent liquid thread sealant, tighten with spanners, then leak test under pressure with a foaming agent and run an operational test. ELAFLEX recommends its LPG 16 S hose, an ARK 19 Mod.2 safety break and the NB-GG nozzle boot. Fill point adaptors are not recommended.

Who should install it

ELAFLEX states the nozzle must be installed by competent personnel following applicable laws and codes. In the US that usually means NFPA 58 as adopted by your state, plus your authority having jurisdiction. In Texas, LP-gas activities fall under the Railroad Commission of Texas, which publishes its own guidance on autogas dispensers. This page summarizes the manufacturer's instructions; it does not replace them or your installer.

Connecting the nozzle to the hose

Choose the inlet that matches your hose end: ½" NPT female (.2) or ¾" NPT female (.3).
Do not use PTFE tape. ELAFLEX gives two reasons: poor electrical conductivity, and the risk of tape particles breaking loose into the flow path.
Use a non-permanent liquid thread sealant.
Assemble with spanners, not pipe wrenches on the nozzle body.
Pressurize and check every joint with a foaming leak-detection agent.
Run an operational test with the hose assembly and confirm no leaks at the nozzle, the hose connector and the swivel.

Recommended accessories

Item	What it does
LPG 16 S dispensing hose	DN 16 mm, highly flexible, low permeation, meets EN 1762 and AS/NZS 1869:2012. ELAFLEX recommends professionally assembled hose.
ARK 19 Mod.2 safety break	Protects against drive-off incidents. Reconnectable by hand under pressure.
BS 19 break sleeve	Companion sleeve for the safety break.
NB-GG nozzle boot	Fully enclosed holster for GasGuard nozzles, so residual LPG in the nozzle can't enter the dispenser housing. Has provision for a lock.
KS 16 anti-kink sleeve, CS 16 colour sleeve	Protect the hose at the nozzle end and mark the fuel grade.

US installations must use hose, breakaways and boots acceptable under your local code. Ask your installer before substituting.

Reed switch dispensers

If your dispenser starts the pump with a reed switch at the back of the nozzle boot, order the nozzle with the J magnet option. Without it, the pump won't sense the nozzle being lifted.

Avoid fill point adaptors

ELAFLEX does not recommend adaptors between nozzle and fill point. They increase the volume of gas released on disconnect and can damage worn receptacles. Removing the need for an adaptor on recessed valves is the main reason the GG20 exists.

Quick answers

Can I use PTFE tape on a GG20 inlet thread?

No. ELAFLEX says not to, because PTFE tape conducts static poorly and can shed particles. Use a non-permanent liquid thread sealant.

Do I need the magnet option?

Only if your dispenser uses a reed switch in the nozzle boot to start the pump.