Check the listing for details. 2x Stainless Steel Pressure Washer 1/4" NPT Male Quick Connect Socket Coupler US. Condition: New. Listed at 16.65 USD. Sizes are given in NPT (National Pipe Thread) sizes. NPT to standard measurements are as follows: 1/4" NPT = .540" 3/8" NPT = .675" 1/2" NPT = .840" Specification: These 8 ball quick connect sockets are precision machined. They feature stainless steel ball bearings which provide smooth action and reliable service that resists plug deformation when pressure spikes occur. The quick connects feature an unrestricted bore for free flow and minimum pressure (PSI) loss. They come with a replaceable o-ring seal. They also sport a brushed brass socket that features a smooth action collar with easy to grip barreled rings rated to 210°F degrees. Package Included: 2 x Coupler On Sep 13, 2023 at 00:41:42 PDT, seller added the following information: