Fireboy-Xintex System Ready Panel Warning Light TPALOCK3 How safe are these cylinders

How safe are these cylinders

817 MasterTorq® 1 Year Warranty Sound Dampening Hub Kit [SDH]

rocker switch

but the 5206-N has a nylon ferrule

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Fireboy-Xintex System Ready Panel Warning Light TPALOCK3 How safe are these cylindersSystem Ready Panel Warning Light The green warning L. E. D. provides constant monitoring of the fire suppression system when the ignition switch is On. Complies with U. S. Coast Guard requirements for system approval. This 2" round indicator light has an adhesive back aluminum plate for easy panel mounting and requires a 5 16" hole for wire routing. Standard with all pre engineered fire extinguishing systems. Compatible With: MA2, CG2 and GA