SurgiVet Christmas Tree Adaptor (Female, Large). Used to facilitate the connection of different diameter tubing to luer lock devices such as syringes or catheter fittings. The PFLLAL is the most popular adapter and is commonly used to assist syringe feeding via a silicone nasogastric tube or a PEG tube, injection of a foley catheter for bladder studies, or connecting a foley to a closed collection bag. Female Luer lock to tapered catheter end, fitting accepts 20-40 Fr I.D. PFLLAL.