This 1/4" NPT M-Style ® kit offers a variety of fittings. Kit includes three #716 couplers, one #272 plug and one #685-4 manifold. The 1/4" FNPT couplers are made of brass, the 1/4" MNPT plug is made of steel and the 3 in 1 manifold is made of aluminum. The manifold boasts a 1/4" FNPT inlet and three 1/4" FNPT outlets so you can use up to three tools at once.