#1 Screw - flathead #12 x 1 in. 552472 $4.99 #2 Knob - engagement shaft 191472 $15.45 #3 Air bleeder w/o-ring 272515 $7.72 #4 Adapter - tank top 191475 $29.45 #5 Gauge - back mount pressure 155050 $25.53 #6 O-ring 47mm x 4mm 155564 $9.64 #7 Top with knob - tank ST35 191954 $160.06 #7 Top with knob - tank ST40/50 black 191500 $210.07 #7 Top with knob - tank ST80 black 191509 $307.07 #8 Nut- 1-7/8 in.- 8 in. buttress 191478 $7.56 #9 O-ring 7/8 in. x 1-1/8 in. x 1/8 in. 191479 $4.99 #10 Shaft - engagement ST35 191955 $17.17 #10 Shaft - engagement ST40/50 191480 $25.65 #11 Manifold assy. 191950 $94.27 #12 O-ring - 12-1/32 in. dia. tank 174704 $17.97 #13 Grid - ST35 13-1/8 in 191321 $35.77 #13 Grid - ST40/50 19-3/4 in 191322 $48.43 #13 Grid - ST80 26-1/4 in., 191510 $59.74 #14 Retainer - grid btm 191467 $44.34 #15 Btm. - tank ST35 black 191504 $125.89 #15 Bottom - tank ST40/50 blk. 750009 $145.45 #15 Bottom - tank ST80 blk. 191511 $152.57 #16 Pipe - center w/diffuser ST35 w/o-ring 191942 $118.92 #16 Pipe - center w/diffuser ST40/50 w/o-ring 191483 $97.27 #16 Pipe - center w/ diffuser ST80 w/o-ring 191512 $55.86 #17 O-ring 1-3/4 in. x 2 in. x 1/8 in 191474 $4.99 #18 O-ring 3-1/2 in. x 3-7/8 in. x 3/16 in 191424 $5.68 #19 Foot - tank 191423 $49.94 #20 Check valve assy. 191437 $43.54 #21 Nut hex 1/4 in.20 serrated s/s 98211400 $4.99 #22 Rod - 1/4 in. x 15 in. s/s ST35 191948 $17.97 #22 Rod - 1/4 in. x 21-1/2 in. s/s ST40/50 191430 $18.65 #22 Rod - 1/4 in. x 28 in. ST80 191513 $23.33 #24 Bolt - 5/16 - 18 x 4 in. carriage 152060 $8.24 #25 Washer 5/16 in. i.d. x 3/4 in. o.d. s/s flat 072173 $4.99 #26 Knob (fits clamp w/removable bolt only) 174882 $27.09 #27 Washer split lock 1/4 in. 18-8 SS 072172 $3.99 #28 Plug 1-1/2 in. w/ O-ring 552622 $4.99 #29 Piping - btm. w/check valve order with locknut 191469 $153.57 #30 Band assy. - complete 174880 $100.31 #31 Grid assy. /comp. ST35 191953 $288.90 #31 Grid assy. /comp. ST40/50 191486 $333.76 #31 Grid assy. /comp. ST80 191519 $401.66 #32 Tubing 1/4 in 191606 $4.72 #33 Strainer - air relief 191329 $9.48 #34 Retaining ring 175020 $4.96 #36 O-ring for Center Pipe 191517 $4.99 SYSTEM REPLACEMENT PARTS