Black & Decker™ Nipple measuring 1/4"-18 X 1 1/2" is designed for 3 HP 15 gal, 6 HP 30 gal, 3.5 HP 25 gal, 3 HP 15 gal, 3.5 HP 20 gal, 1 HP compressors, 120 V air compressors, Porter Cable® 1 HP 6 gal, 2.5 HP 4.5 gal, 2.5 HP 4 gal, 2 HP 6 gal, 2.5 HP 6 gal, 3 HP 4 gal, 3.5 HP 4 gal compressor, 4 gal, 3.5 HP 4.5 gal air compressor, pancake air compressor, oil less vertical air compressor, 5.5 HP 8 gal gas powered air compressor, 2.5 HP 4 gal oil-lube air compressor, oil-free portable air compressor, DeVilbiss construction compressors, hand carry compressors, workshop/auto compressors, compressors, 1.5 HP 4 gal, 4 HP 12 gal air compressors, DeWalt® 1.5 HP compressors, electric compressor, Bostitch 15 gal VP EHP of 200 PSI bonnet.