NPT Quick Disconnect Couplings Size: 1/4" NPT Set of 4 Standard: ISO 7241-1 Series "A" Material: Carbon steel with carbonated black tip making it more corrosion resistant Seals: NBR Interchangeable with: Snap Tite 61, Parker 6600, Aeroquip 5600, Dixon K, Safeway S56, Tomco A5600, Stucchi BIR, Faster ANV Material: Steel Features: 5075 PSI Rating, Hardened Steel Plugs Shipping: Item ships from Houston, TX Additional Sizes: SIZE Set of 1 Set of 4 Set of 10 1/4" Series A $19.99 $34.99 $89.99 1/4" Series B $21.99 $39.99 $99.99 3/8" Series A $20.99 $42.50 $99.99 3/8" Series B $22.99 $42.50 $109.99 1/2" Series A $21.99 $52.99 $119.99 1/2" Series B $24.99 $54.99 $129.99 3/4" Series A $24.99 $64.99 $149.99 3/4" Series B $29.99 $69.99 $159.99 1" Series A $34.99 $109.99 $259.99 1" Series B $39.99 $119.99 $279.99