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2015 Maxitrol Company. All Rights Reserved. DRAFT 09.18.2013 62 NOTE If vent limiting device is not used regulator vent must be piped in accordance with government and local codes and regulations. RV12L RV20L Integral vent limiting orifice with dust cap standard. RV20VL Integral vent limiting orifice with dust cap standard or use 11A08 threaded sleeve nut and run vent line as per code. RV47 Must order L suffix - Integral vent limiting orifice includes dust cap or D suffix - integral ball-check limiting device includes dust cap. RV48 18 NPT vent tap. Optional 12A04 or 12A06 vent limiter. Optional 13A09 dust cap. Optional 10A16-2 or 10A16-3 plastic thread protector. RV48L Integral vent limiting orifice. RV52 RV53 RV61 18 NPT vent tap. Optional 12A04 or 12A06 vent limiter or 13A15 vent protector. RV81 38 NPT vent tap. Optional 12A34 vent limiter or 13A15-5 vent protector. RV91 2 12 pipe size 14 NPT vent tap. Optional 13A15 vent protector. Vent limiter not approved for this model. RV91 2 pipe size 12 NPT vent tap. 2 pipe size. Optional 13A25 vent protector. Vent limiter not approved for this model. RV111 RV131 34 NPT vent tap. Vent limiter not approved for these models. 210D 38 NPT vent tap. Optional 13A15-5 vent protector. Vent limiter not approved for this model. 210E 12 NPT vent tap. Optional 13A25 vent protector. Vent limiter not approved for this model. 210G 210J 34 NPT vent tap. Vent limiter not approved for these models. 220D 220E 220G 220J Pilot regulator is equipped with 12A06 vent limiting orifice separate vent line is not required. 325-3 325-3L 18 NPT vent tap. Optional 12A09 vent limiting device or 13A15 vent protector. 325-5 325-5L 38 NPT vent tap. Optional 12A39 vent limiting device or 13A15-5 vent protector. 325-7A 325-7AL 12 NPT vent tap. Optional 12A49 vent limiting device or 13A25 vent protector. 325-9 325-9L 12 NPT vent tap. Optional 12A49 vent limiting device or 13A25 vent protector. R400S R500S R600S 18 NPT vent tap. Optional 12A04 vent limiting device. OPD47 Integral vent limiting orifice includes dust cap. OPD48 OPD600 18 NPT vent tap. Optional 12A09 vent limiting device or 13A15 vent protector. OPD210D 38 NPT vent tap. Optional 12A39 vent limiting device or 13A15-5 vent protector. OPD210E 12 NPT vent tap. Optional 12A49 vent limiting device or 13A25 vent protector. NOTICE Maxitrol vent limiting devices eliminate the need to run vent piping to the outside. Vent limiting devices are designed for use indoors and in spaces where limiting the amount of gas escapement due to diaphragm failure is critical. Vent limiting devices should not be used outdoors if they are exposed to the environment. Vent protectors are available for all outdoor applications to ensure proper vent protection. CHOOSING A VENT ACCESSORY