AquaMaxx Replacement Thumb Screw

Grouped product items
Product Name Qty
Replacement Thumb Screw - 5/16-18 x 2 Inch

SKU: 232607

In stock


- +
Replacement Thumb Screw - M6 x 35mm

SKU: 232608

In stock


- +
Replacement Thumb Screw - M6 x 75mm - 5 pack

SKU: 232609

In stock


- +
Replacement Thumb Screw - M5 x 20mm

SKU: 232623

In stock


- +
Replacement Bracket Screws for HOB-1 and HOB-1.5 Protein Skimmers

SKU: 232595

In stock


- +

No need to fret over lost or cracked thumbscrews for your skimmers and reactors-- these nylon screws are direct replacements manufactured by AquaMaxx, for AquaMaxx. Read through the descriptions below to select the right size for your needs.


Part Reference Guide



AquaMaxx Protein Skimmer Models

5/16-18 x 0.5

232606 Most AquaMaxx In-Sump Protein Skimmer air silencers
BioMaxx BioPellet Reactor hang-on tank adaptor
cTech Calcium Reactor bubble counters
Fluidized GFO & Carbon Media Reactor hang-on adaptor

SS-¾ Protein Skimmer pump lock

5/16-18 x 2

232607 SS-¾ Protein Skimmer bubble plate
AM Series Skimmer bubble plate
Cone Series Skimmer bubble plate

M6 x 35mm

232608 HOB Skimmer hang-on bracket

M6 x 75mm

232609 HOB Skimmer air silencer
HOB Skimmer body assembly 
HOB Skimmer bubble plate
AM Series Protein Skimmer air silencer

M5 x 20mm

232623 BioMaxx Biopellet Reactor lid
Fluidized GFO & Carbon Media Reactor lid (XS, Standard, XL, and XXL)
FR-SE GFO Carbon & Biopellet Hang-On Filter Media Reactor lid
CO-1 Protein Skimmer base
Zeo Reactor lid
Calcium Reactor lid
AM Series Protein Skimmer bubble plate (with external pump)


More Information
SKU AquaMaxx Replacement Thumb Screw - AquaMaxx
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Product Questions

Which thumb screws do I need for the Ctech T-2 lid?
Question by: SCOTT CLICK on May 7, 2022, 8:18 PM
Hey there,
Thank you for reaching out to us. That lids needs the SKU# 232623 / M5 x 20mm screws.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 10, 2022, 12:04 PM