These couplers and plugs have a smooth, straight-through bore (NO valves) to permit maximum flow. They are commonly used for hot water supply lines for carpet cleaners and for pressure washers.
New-Line 1/4" BRASS STRAIGHT THRU MALE NPT X NIPPLE
Really great product and I highly recommend this product. Spray on, spray off, leaves a nice deep shine and super smooth feeling. Works well on my customers vehicles and it’s lasts a strong 2 months. Excellent protection