My 10+ year old s-715 hisses, even after installing new s-727 plugs. does the very small o-ring in this s-715 eventually wear out?

Yes, orings can get old and less plyable so they will not seal as well

is this for high pressure propane on an RV tank?

The model number S-715 will be an air style fitting. The maximum pressure will be 300 PSI.

Mine says made in USA on packaging. Nothing listed on the part itself. I like mine, purchased several and all work good. Would buy again.

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Industrial Coupler 1/4" NPT Female Brass, M-STYLE® Quick Connect Air Coupler, S-715 - Pack of 10

Product ID: 37180212

Details

Brand
Milton
Color
Red
Connector Type
Coupling
Exterior Finish
Alloy Steel
Item Weight
0.1 Pounds
Item dimensions L x W x H
1.96 x 0.93 x

💨40 SCFM airflow - high efficiency

🔥Max temp 250°F - heat resistant

🔩1/4" NPT female thread - universal fit

$28.34

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Description

⚙️ Connect Like a Pro — Don’t Let Your Air Tools Fall Behind!

HEAT LEAK RESISTANT SEALS - Buna-N seals maintain airtight connections even at temperatures up to 250°F, reducing downtime.
KWIK CHANGE INTERCHANGEABILITY - Military-spec compliant design ensures effortless swaps across most manufacturers’ systems.
DURABLE BRASS STEEL CONSTRUCTION - Heavy-duty brass body with case-hardened steel drag guard resists rust and accidental uncoupling.
HIGH PERFORMANCE AIRFLOW PRESSURE - Supports up to 40 SCFM and 300 PSI for reliable, powerful pneumatic tool operation.
INDUSTRY STANDARD M STYLE COMPATIBILITY - Seamlessly connects with Milton, ColorFit, and red competitor couplers for ultimate versatility.

The Milton S-715 Industrial Coupler is the gold standard 1/4" FNPT female brass quick-connect coupler, engineered for professional-grade pneumatic systems. Compatible with all major M-Style fittings and compliant with military specs, it delivers up to 40 SCFM airflow and withstands pressures up to 300 PSI and temperatures up to 250°F. Built to last with rust-resistant materials and leak-proof Buna-N seals, this coupler ensures your air tools perform flawlessly, making it a must-have for any serious workshop or industrial setting.

Specifications

ASIN	B0002SQTAK
Best Sellers Rank	#20,696 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Air Tool Fittings
Brand	Milton
Brand Name	Milton
Color	Red
Connector Type	Coupling
Customer Reviews	4.7 out of 5 stars 1,930 Reviews
Exterior Finish	Alloy Steel
Global Trade Identification Number	00030937007155
Included Components	Female M-Style Coupler
Item Dimensions	1.96 x 0.93 x 0.93 inches
Item Type Name	Coupler
Item Weight	1.6 ounces
Item dimensions L x W x H	1.96 x 0.93 x 0.93 inches
Manufacturer	Milton Industries
Manufacturer Part Number	S-715
Manufacturer Warranty Description	1-Year Limited Warranty
Material	Brass
Material Type	Brass
Model Number	S-715
Number of Pieces	1
Size	1/4 inch (Pack of 1)
Thread Type	NPT
UPC	030937007155
Unit Count	1.0 Count

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