How will the bulkhead connector hold up to alcohol based fluids like ethanol?

I don't know, but doesn't the alcohol come in a plastic bottle?

Will these work for a 12v 30amp application? i see a qc rating of 500v/ 30a but not sure how this translates to dc.

I would say so, since I am connected and draw about 25A at 12 volts without any heat being developed. Just use a wire rated for more than 30A

How can you solder to the back of the male part you cannot reach it?

Twist the plug shell, then put the shell into the cable and solder the cable, and finally twist it back to install the shell

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SP21 2Pin-12Pin Panel Mount 21mm Waterproof Circular Electrical Wire Connectors,Aviation Cable Connectors (2Pin, Plug Female & Socket Male)

Product ID: 218731374

Details

Brand
SZJELEN
Color
Plug Female &
Connector Type
Solder
Material
Brass Plastic
Voltage
1500 volts

⚡30A High Current Capacity

💧IP67 Waterproof Seal

🔩21mm Thread Diameter

AED 92

Duties & taxes included

In stock

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Description

🔌 Connect with Confidence — Waterproof, Powerful, Professional.

VERSATILE PIN OPTIONS - Supports 2 to 12 pins, perfect for complex aviation and industrial wiring setups.
POWER THROUGH WITH 30 AMPS - Handles up to 500V AC and withstands surges up to 1500V for ultimate electrical safety.
DURABLE BRASS PLASTIC BUILD - Combines corrosion-resistant brass with rugged plastic for long-lasting performance.
PRECISION FIT WITH 21 MM THREAD - Engineered for secure panel mounting with a robust 21mm diameter thread.
UNRIVALED WATERPROOF PROTECTION - IP67 rating ensures your connections stay dry and reliable, rain or shine.

The SZJELEN SP21 series offers IP67-rated waterproof circular connectors with 2 to 12 pin configurations, supporting up to 30A current and 1500V withstand voltage. Designed with a 21mm thread diameter and crafted from durable brass and plastic, these aviation-grade connectors ensure secure, reliable electrical connections in demanding environments.

Specifications

ASIN	B07YWKBSVR
Amperage	30 A
Best Sellers Rank	#1,336 in Audio & Video Connectors & Adapters
Brand Name	SZJELEN
Color	Plug Female & Socket Male
Connector Type	Solder
Customer Reviews	4.4 4.4 out of 5 stars (141)
Item Weight	18.14 g
Manufacturer	SZJELEN
Material Type	Brass, Plastic
Number Of Wires	14
Number of Poles	2
Plug Type	2Pin
Specification Met	UL, cUL
UPC	729257496205
Unit Count	1 Count
Voltage	1500 volts

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