What is the lifespan of these connectors?

Usally my hoses gets holes before the connectors give out.

These are for a 3/8" air line if that's what you're asking? The Fittings/couplers themselves are marked style "M"

Are these water tight?

I bought this pack from Harbor Freight specifically to use for water lines at residential pressure levels (my home is 90-120psi), and the connection was water tight for me.

Can these handle air and steam?

I do not know if they will handle steam. I bought them for use with an air compressor -up to 300 psi. I have had no problems with them. Make sure to use teflon tape on any threaded connections.

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Milton S-314MKIT Kit, 14pc M Style 1/4", Original Version, 14 Piece

Milton S-314MKIT Kit, 14pc M Style 1/4", Original Version, 14 Piece

Product ID: 115876460

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Details

Size
14 Piece
Material
Alloy Steel
Brand
Milton
Colour
Original
Item dimensions L x W x H
23 x 23 x 48
Connector type
NPT

🔴color-coded red for quick line ID

🛠️14-piece comprehensive kit

🛡️anodized scratch-resistant steel

Description

🔧 Elevate your air line game with Milton’s pro-grade, color-coded precision kit!

COLOR FIT RED CODING - Instantly distinguish air lines for safer, faster connections and fewer errors.
COMPLETE 14 PIECE SET - Everything you need in one sleek, professional kit to streamline your workflow.
DURABLE ANODIZED STEEL - Scratch-resistant alloy steel ensures long-lasting performance under pressure.
PUSH TO CONNECT CONVENIENCE - Effortless, secure fittings that save time and reduce downtime on the job.
UNIVERSAL M STYLE COMPATIBILITY - Seamlessly works with Milton M-style and red competitor couplers for ultimate flexibility.

The Milton S-314MKIT is a 14-piece M-style air coupler and plug kit featuring anodized, scratch-resistant alloy steel construction. Designed for professional use, it offers color-coded red fittings for easy line identification and universal compatibility with Milton and competitor M-style couplers. This kit ensures durable, quick push-to-connect performance for efficient and reliable pneumatic setups.

Specifications

Manufacturer	Milton
Part Number	S-314MKIT
Product Dimensions	2.29 x 2.29 x 4.83 cm; 376.48 g
Item model number	S-314MKIT
Size	14 Piece
Colour	Original Version
Style	Kit
Material	Alloy Steel Aluminum
Item Package Quantity	1
Number of Pieces	14
Measurement System	Inch
Included Components	1 Milton Branded Product
Batteries included?	No
Batteries Required?	No
Item Weight	376 g