X-TYPE-UNION X-TYPE-UNION Y-TYPE-UNION-TEE-I T-TYPE-UNION-TEE T-TYPE-UNION-ELBOW L-TYPE-MALE-CONNE L TYPE UNION ELBOW L TYPE-UNION-INDISE D-TYPE RL-TYPE RT-TYPE RE-TYPE DT-TYPE P-TYPE-UNION LENGTH-NUT ET-TYPE-1 E-TYPE-2