Barton BPI-25 Bulkhead Pipe Gland Reducer 25mm f/BPG-50 [BPI-25]BPI 25 Bulkhead Pipe Gland Reducer 25mm for BPG 50 This adaptor enables smaller pipes to be used in conjunction with the BPG 50 Pipe Gland. This will accept pipes between 22. 5 and 25mm. These glands give a water and vapor proof seal between bulkheads. They are flexible and will accommodate curved surfaces and pipe entry at an angle. They are easy to fit and fully serviceable in situ.