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375, 375XL ¾”-1”

375, 375XL ¾”-1”. Modification Overview. Production of the ¾”-1” 375 began in 2004 and is current. The lead free version 375XL was introduced in 2010. Housing Removal. The plastic housing (vessel) must be removed for service. There is no spring load.

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375, 375XL ¾”-1”

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  1. 375, 375XL¾”-1”

  2. Modification Overview • Production of the ¾”-1” 375 began in 2004 and is current. • The lead free version 375XL was introduced in 2010.

  3. Housing Removal • The plastic housing (vessel) must be removed for service. • There is no spring load. • Housing is held in place by a wedge and o-ring sealed on both ends. • Remove wedge screws.

  4. Housing Removal • Pull wedge straight out. ** Inserting a screw in center hole can help remove stuck wedge. • Slide housing towards inlet and lift upward.

  5. Check Valve Removal • Check valve modules. • Modules are located inside the housing. • Modules are sealed by o-rings. • Both modules slide out of the body inlet.

  6. Disassemble Check Module • Modules are spring loaded. • Holding firmly, twist spring retainer counter clockwise.

  7. Check Seat Removal • Check seat is free once the module has been disassembled. • If the seat is damaged, the entire module must be replaced.

  8. Check Disc Replacement • Remove screw, disc retainer, and disc.

  9. Check Valve Reassembly Notes • Lubricate o-rings on modules. • Drop #2 module in body. Then drop #1 module in and turn until #1 spring retainer lines up with #2 seat. • Push both modules into housing.

  10. RV Cover Removal • RV cover is sealed by the diaphragm. • There is a slight spring load on cover. • Hold cover firmly while removing screws.

  11. RV Stem Removal • Gently pull the RV stem out of the housing. • Spring is free once the stem is removed.

  12. RV Seat Removal • RV seat is o-ring sealed. • Pull seat straight out of housing.

  13. Disassemble RV Stem • Remove RV retaining screw. • Pull plunger and disc holder apart.

  14. RV Rubber Replacement • The RV disc and diaphragm are free once the stem has been disassembled. • Reassemble in reverse order.

  15. RV Reassembly Notes • Lubricate plunger o-ring on stem. • Insert RV stem into cover. • Place spring in position over seat. • Make sure sensing o-ring is in position. • Insert cover and stem into housing.

  16. Housing Replacement Notes • Lubricate o-rings on inlet and outlet of housing. • Place housing between struts. • Slide retaining sleeve downstream against housing. • Replace wedge and wedge screws.

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