Straight Connectors PI201610S 1/2"X5/16" Straight Connector £0.69 PEM0415W 15mm Equal Straight PEM0415W £1.04 PI011222S 3/8 x 1/4 Male Connector 3\8" X 3\8"BSP PI011213S £0.55 SM040808S 5/16'Superseal-5/16' connector £1.03 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