Veloci’s American-made Prima quick connects are made of the highest quality American stainless-steel. 100% machined from round bar stock at our manufacturing facility in Minnesota. What makes PRIMA better than the rest? Absolute Top Quality 303 stainless-steel sourced from the City of Steel - Pittsburgh, PA USA 100% machined to precise specifications: +/- 127µm, +/- 1º on working angular surfaces 3x more precise than the competition; precision means better fit and longer life Quality controlled by digital comparator De-burred and washed for premium polish and smoothest action in the industry EPDM seals for high temperature and chemical tolerance Stainless-steel fittings offer anti-corrosive properties and reliable performance. They are commonly found at all joints where high pressure fluid may need to be disconnected after use. Other areas such as lances, tips, and foam cannons are convenient places to install these QC's. As a rule of thumb, Veloci’s 1/4 couplers are normally found at the end of the pressure washing system, on a spray wand or outlet of the spray gun. When purchasing plugs and couplers the male fitting has exposed threads while the female fitting has threads on the interior of the fitting. See image for reference. All Veloci fittings are National Pipe Thread (NPT) which means they have a tapered male or female thread (depending upon the model). NPT is mainly used in North America and was developed on the concept of interference by the third thread. When installing NPT fittings to another NPT thread we recommend that you use 4-5 wraps of Teflon tape wound clockwise, or 2-3 drops of Loctite thread sealant.