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                BURNER ORIFICES
 PLUG ORIFICES FOR MAIN BURNERS
These popular orifices are used on water heaters, cooking equipment, clothes dryers
and space heating. All are centered drilled with number 72 drill (except pipe plug blanks). Plugs must be re-drilled with the proper bit to suit each application.
   1/8 MIP PO519
MALE PIPE TAPERED BLANK KNURLED HEAD 1/4 MIP 1/8 MIP
HEX HEAD
1/4 MIP PO525
   5/32" DIA. RIVETED           #10-32 THREAD
PO520 PO523
SMALL PLUG ORIFICES PREDRILLED #72 - USER MUST REDRILL
 #6 - 32 THREAD PO539           PO516
   MI100
RIVET SET
ALLEN SOCKET
SMOOTH HEAD SLOTTED CAP JET
            HEX HEAD PLUG ORIFICES PREDRILLED #72 - USER MUST REDRILL
- 1/2" HEX
- 1/4" COMP. (7/16 - 24)
 THREAD SIZE Dia.
Thd.
Hex
Part No.
(DIA.)
1/4
28
32
24
27
32
27
32
32
24
27
24
27
18
27
27
1/4 5/16 5/16 3/8 5/16 3/8 3/8 7/16 1/2 1/2 9/16 9/16 5/8 9/16 11/16
PO508 PO515 PO530 PO529 PO533 PO531 PO518 PO538 PO543 PO511 PO554 PO556 PO557 PO558 PO559
    1/4 5/16 5/16 5/16 11/32 11/32
Natural Gas BJ218N
                             WRENCH SIZE 3/8 (HEX) 7/16
  THREADS 7/16
LP Gas BJ218LP
 PER INCH 1/2
 (THD) 1/2 9/16
    MI-100K ORIFICE REBUILD KIT Part No.           Description
With this rebuild kit a service man can renew 80 to 90 percent of all burner orifices.
9/16 5/8
    1.) Remove old orifice
2.) Ream old orifice with sizing reamer.
3.) Insert adapter in hole
4.) Use driving tool to position new
               MI100K MI100
KIT ADAPTER
adapter
5.) Use crimping tool to secure adapter 6.) Drill adapter to proper orifice size.
Kit includes all tools needed to assemble MI100 adapter and 100 MI100 adapters.
Prices subject to change without notice 245 © 1971-2018 w.d. armstrong corp.
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