Straight Connectors PI451616CS BSP Female Connector 1/2" x 3/4" POA PI0416S Straight connector, 1/2" OD Equal £0.90 PM0415E Straight connector, 15mm £0.96 PI0406S Straight connector, 3/16" OD Equal £0.50 PI0412S STRAIGHT CONNECTOR, 3/8" OD Equal £0.74