... * Series PAL/BSLU plastic silence B typeExhaust Muffler throttle Valve * Series BSL silencer;* Series BESL flow control silencer;* ... anti-corrosion and anti-contamination.4)All threads are pre-coated with Teflon sealant and require no additional ... steel mesh filter, muffler BSL, muffler BSLM, muffler exhaust throttle BESL, muffler exhaust throttle BESLD, copper / stainless steel sintered ( filter, ...