KHAOS^® Waterboy Junior – Forearm Water Instability Trainer for Arm Efficiency & Glove Connection

Forearm water trainer

Oates Specialties KHAOS® Waterboy Junior – Forearm Water Instability Trainer for Arm Efficiency & Glove Connection, wrist weights and shoulder tools: photo from Oates Specialties — Photo: Oates Specialties

Facts as the maker states them, read 13 Oct 2026

The KHAOS Waterboy Junior is a forearm water instability trainer with a blue, see-through cylindrical body, dual neoprene straps, and a locking fill valve, sold as a single tube or a matched pair. The page states it trains glove or mitt-side path quality, limb-level perturbation control, running-form symmetry, and position-sense awareness, for athletes roughly 13 and older under supervision.

Type	Forearm water trainer
In the set	Single tube (WBJ1) matched pair (WBJ2)
Weights	~10 oz empty per tube; ~3 lb of water max per tube
Sizes	Single; Pair
Ages	roughly 13 and older
Also on the page	Max capacity ~3 lb of water per tube Empty weight ~10 oz per tube Sized to sit above a standard baseball or softball mitt confirm exact length and diameter before publication Blue, see-through cylindrical body dual neoprene straps (soft sleeve material) locking fill valve
Warranty	60-day limited warranty
Availability	In stock
Maker SKU	WBJ1; WBJ2
The maker says	It is built for baseball pitchers (glove-side connection), catchers (mitt-side receiving stability), position players and sprinters (arm-swing organization).
Source	oatesspecialties.com, product page, read 13 Oct 2026

Pat's Grade one person's opinion, with the reason

Not yet graded

Patrick has not graded this line yet. A line not handled yet says Not yet graded, never a low grade.

We have no dealer or affiliate relationship with Oates Specialties. If that changes it will say so here, and the grade will not move. How we grade

Evidence public reviews and break reports, with links

No public reviews found for Oates Specialties.

What "buyer reports" means

Public review counts and themes we found for this maker, with links, plus break reports sent in by site users. Where we found nothing public we say so.

Anytime Baseball SupplyRetailer ratings: TAP weighted baseball0 reviews
Pavilion (supplier directory)Other source: Oates Specialties supplier profile0 reviews
Anytime Baseball Supply Daily Diamond blog (Kevin M. King, undated)Other source: Best weighted baseballs roundup, TAP entryThe source says: Calls TAP the store's best-selling and highest-rated weighted ball with a durable synthetic leather cover
SidelineSwapOther source: Used pitcher's training kit with TAP items0 reviews
Local Gyms and Fitness (directory)Other source: Oates Specialties LLC profile0 reviews

Break reports from players on this site

0 break reports so far.

Report a break