These 1/4" and 3/8" Brass Insulated Quick Connect Sockets are precision machined and provide smooth action and reliable service. They resist plug deformation when pressure spikes occur. The flow thru design provides unrestricted bore for free flow and minimum pressure loss. The push and snap-lock coupler feature a replaceable o-ring seal. The brushed brass socket features a smooth action insulated collar with easy to grip insulated rings rated to 210°F. To withstand 300°F hot water and aggressive chemicals also purchase a Replacement Viton or Buna O-Ring Packs (SKU: 39.0028). See Related Products below.